it is用法
it和is的用法区别
it和is的用法区别一、理解it和is的基本概念在英语中，it和is都是常见的单词。
它们在不同的语境中有着不同的用法和意义。
为了正确地使用它们，让我们首先了解一下它们的基本概念。
1. it：it是一个代词，用来指代非人类事物或抽象概念。
当我们无法确定性别或没有特定主语时，就可以使用it来引用某个事物。
2. is：is是be动词（be verb）的第三人称单数形式。
它被用来描述第三人称单数主语（He、She、It）所具有的状态、特征或性质等。
二、it和is在句子中的不同作用1. it作为主语：在句子中，it通常作为主语出现，并指代前面提到过或将要提到的事物。
例如：- It is a beautiful day. （今天天气很好）- It is important to study hard. （努力学习很重要）2. is作为be动词：is通常与他/她/它相关联，并与其他词汇一起构成谓语部分。
例如：- She is an excellent athlete. （她是一名优秀的运动员）- The dog is sleeping under the tree. （狗正在树下睡觉）三、it和is在不同语境下的用法区别1. 时间和天气的描述：在表示时间和天气的描述中，it常作为虚主语，用来指代具体的时间或天气状况。
例如：- It is 3 o'clock. （现在是三点钟）- It is raining outside. （外面正在下雨）2. 表达感受或情感状态：当我们表达个人感受或情感状态时，it也常被使用。
例如：- I find it difficult to understand this concept. （我发现这个概念很难理解）- It makes me happy to see my friends succeed. （看到我的朋友们成功使我很开心）3. 强调特定主语（刻板用法）：有时候，我们使用it来建立一个结构，以便更好地强调动词或补语。
It is ..that 句型
写作必会句式训练It is + 过去分词+ that - clause一．句型归纳：1.It is said that .... 据说……2.It is reported that .... 据报道……3.It is decided that .... 根据决定……4.It is believed that .... 人们相信……5.It is thought that .... 人们认为……6.It is expected that .... 人们期待……7.It is hoped that .... 人们希望……8.It is supposed that .... 据推测说……9.It is well-known that .... 众所周知……10.It is generally accepted that .... 普遍接受11.It is generally considered that .... 普遍认为12.It must be kept in mind that .... 一定要记住13.It must be admitted that....必须承认……14.It must be pointed out that....必须指出……15.It has been proved that....有人已经证实……二．语法填空：（主要考察这次所学句型）Yes, SARS is striking our country, but not the whole. And not all the schools in Beijing are closed, either. _____1_____ is reported that most schools are going as usual, including mine. _____2_____(frighten) as some people are, yet the majority are treating it rationally (理性地).It is well-known that any new disease is _____3_____(cure) when it just appears to mankind. SARS is no exception. Therefore, it must _____4_____(keep) in mind that there should not be any fuss over it. It is believed that SARS _____5_____(spread) mainly by air according to the latest _____6_____(discover). To protect us human beings from it, scientists have suggested many ways as follows:Before going out, put your masks(口罩). Reduce your visits _____7_____ your friends and relatives. It is _____8_____(general) accepted that windows should be kept open to keep the air in your room fresh and _____9_____ your hands and faces should be washed clean when getting home. It must be borne in mind that if you have a temperature or get a cough, you should see the doctor as timely as possible.Now, It is expected that with scientists _____10_____(work) all out on SARS, the day will come soon when man conquer SARS as long as we unite as one.三单句练习：(主要考查我们所学过的三个句型)1）__________________________________________________ in the earthquake-striken areas. 据说，他们正在为地震灾区的人们募集资金。
It is 句型
1.It is / was＋被强调的部分＋that(who)+剩余的部分.如：It wasn’t until he came back that I went to bed.直到他回来我才睡觉。
(一定要注意被强调句型谓语动词否定的转移，及形式)。
It was because he was ill that he didn’t come to school today.只因为他有病了今天没有来上学。
（只能用because而不能用for, as 或since）It is I who am a student. 我确实是个学生。
（句中am不能用are来代替。
）2.It is high time (time/ about time) (that) 主语＋should do / did+其它。
（注意从句中的谓语动词用的是虚拟语气）It is high time that we should go / went home.我们该回家了。
3.It is / was said ( reported…)＋that+从句. 如：It was said that he had read this novel.据说他读过这篇小说。
＝He was said to have read this novel.4.It is impossible / necessary/ strange…that clause.(从句中的谓语用should＋do / should have done，其形式是虚拟语气。
)如：It is strange that he should have failed in this exam.真奇怪，他这次考试没有及格。
5.It is + a pity/ a shame…that clause.(注意从句中的谓语动词用should do 或should have done的形式，但should可以省略。
)如：He didn’t come back until the film ended. It was a pity that he should have missed this film. 他直到电影结束才回来。
“ It is……”句式归纳
“ It is……”句式归纳高中英语教材中出现了不少“ It is ……”这样的句子。
其中it 表达的意义不同，“ It is ……”的含义也就不一样。
本文在此将教材中出现过的这类句子罗列出来，供同学们学习时参考。
一. It is time to do sth. 意为“该是某人做某事的时候了”。
例如：It’s seven o’clock now. Mike，it is time to go to school.7 点了。
迈克，你该去上学了。
此句式的变异形式为：It is time that sb did sth. 该句式表示“某人现在该做某事了”，从句中谓语动词常为过去式，说明现在应该做的事情。
例如：It’s six o’clock. It is high time that we went home now.6 点钟了。
该是我们回家的时候了。
二. It is … when …可用于下面两种场合：1. when 是连词，引导时间状语从句，意为“……的时候已是几点钟”。
例如：It was eight o’clock in the morning when they went shopping.当他们去买东西的时候已经是上午8 点了。
2. when 是关系副词，引导定语从句，它本身在从句中作时间状语。
例如：It was July 10，1992，when he graduated from Nanjing University.他1992 年7 月10 日毕业于南京大学。
三. It is / has been + 一段时间+since 从句。
例如：It is / has been three years since we saw each other last time.我们上一次见面是在 3 年前。
It is four years since I became a student.我上了4 年学了。
It-is-句型
study hard.
这里的it是形 式主语，那么 真正的主语是
什么呢？
It 不是代词么？什 么是形式主语啊？
了解“It”作形式主语的含义
了解 “It’s+ adj.+（of/ for sb） to do sth.” 句式的形态特征
了解 “It’s+ adj. +(of/ for sb）to do sth.” 句式的功能
• 你能帮我，真好。
• It’s very kind of you to help me.
It’s + adj.+ of sb. + to do sth. It’s + adj.+ for sb.+ to do sth.
用介词for或of 引出动作描 述对象
用介词for或of 引出对象
• It is nice _o_f__you to help me do this job. • It is good _f_o_r_you to do morning exercises.
It’s + adj.+ to do sth.
sad, necessary, important, wrong, possible, hard, difficult, easy, good, impolite…
It is _p_o_l_it_e_ to give seats to the elderly on the bus.
•
无S实yd际ne意y 思is 。the
largest
city
in
“真实主语” Australia.
主“形语式表主明语这”句话说的是谁和什么，一般位于
it is…that强调句型
it is…that强调句型
"It is... that"是一种强调句型，用于突出一个特定的信息或对象。
这个句型的结构是：It is + 强调的部分 + that + 其他部分。
例如：
1. It is the love for music that drives him to practice every day.
就是对音乐的热爱驱使他每天练习。
2. It is his hard work and dedication that led to his success.
正是他的努力和奉献精神导致了他的成功。
3. It is the support from her family that gives her strength to overcome challenges.
是来自家人的支持给予了她战胜挑战的力量。
通过使用这个句型，可以将注意力集中在强调的部分上，使其更加突出和引人注目。
它可以用于各种语境和情况下，帮助强调某个特定的事物、人物或情感。
记住，在使用这个句型时，要确保后面的部分与前面的强调部分有密切的关联性，以保持句子的逻辑完整性。
It is句型
③It is +时间段 +since…“自从……以来已经多 久了”； It is two years since he joined the army. 他参军已经两年了。(从句谓语动词为非延续 动词) It is three years since I smoked a cigar. 我不吸烟已有三年了。(从句谓语动词为延续 动词)
③How long do you think it will be ______ the computer company puts forward a new product? A. before B. since C. until D. that [解析]A。How long属于时间段，故选A。
Since用法小结
a) Since后面的动词不同，动作的起算时间不同： since+终止性动词的过去式，从该动作发生时算起；since+ 延续性动词的过去式，从该动作结束时算起。 It’s three years since he joined the League. 他入团三年了。 It is three years since he smoked.他戒烟三年了。 区别：他吸烟已经三年了。He has smoked for three years. b)“ It is/was + 一段时间+ since – clause” 句型的时态。 It’s two years since we arrived here. 我们到这儿两年了。 It was years since I had seen her. 我认识她好几年了。
②How long do you think ______ the computer company launches a new model? A. it will be before B. will it be until C. will it be when D. it will be that [解析]A。do you think为插入语，可知此处应 用陈述语气，排除B、C两项；此处不是强调 句，可排除D；How long属于时间段，故选A。
It-is-+-adj+to-do-sth句型
I t i s+形容词+t o d o的讲解和用法1）It is +形容词to do…. 表示“干某事是…”。
我们通常在口语或者写作中使用这个句型，对于初中的学生来说，十分有必要熟练地掌握好这个句型，它有利于我们在写作中写出结构比较复杂的句子，从而得到较高分数。
例如：1. It's very important to study English well. 学好英语很重要。
2. It is difficult to finish the work today. 今天完成工作太困难了。
3. It's good to eat fruits. 吃水果好。
4. It's right to read English every day. 每天读英语是对的。
5. It's interesting to play soccer. 踢足球是有趣的。
2）即学即练1.It_________ take a bus to go to school.A.is convinientB.is convinient toC.are convinient toD.are convinient2. It is ___________ the old man.A.good to helpingB.good helpC.good to helpD.to help3.It to smoke.A. are badB.is bad toC.is badD.are bad to4.It _____________ see that movie.A. are thrillingB.is thrilling toC.is thrillingD.are thrilling to5.It _______________ go fishing.A. are excitingB. are exciting toC.is excitingD. is exciting to6.It is interesting to play computer games.A. are interestingB. are interesting toC.is interestingD. is interesting to3) 英译汉1.It is safe to take a bus.2.It is funny to watch movies.3.It is possible to see him now.4.It is dangerous to play with a snake.5.It is diffcult to write a English composition(作文).6.It is wonderful to go fishing with my father.7.It is boring to listen to a same song again and again(反复).8.It is hard to be successful man.9.It is pleasant to come back to my hometown.10.It is horrible to see this bad man.4）课后作业1.熟记下列词组difficult to fall asleep 难以入睡easy to read 容易读impossible to find 不可能找到possible to get there 可能到那里nice to live 适合居住safe to live 住起来安全difficult to understand 难以理解pleasant to visit 参观起来令人开心boring to listen to 听起来枯燥hard to plant 难以种植easy to learn易学wonderful to watch 看起来很棒2.巩固复习：根据所给的形容词填空bad, difficult, ill, asleep, impossible1.Mother：Honey！It is too late. You should fall ________now.Son: It is ___________to sleep tonight. I feel __________.Mother: Oh, you looks ________. It is so late, it is ________to take you to the hospital.awake, safe, happy, nice, alone2. Mary:Hello! Are you __________? Lily:Hello! Yes, I am.Mary: Do you like you new house?Lily: Oh, yes. It is ________ to live. But it keep me ______. Mary:You are not __________.Lily:That’s right. But I like it, beause it is _______ to live here.。
It is + adj+to do sth句型
It is+形容词+to do的讲解和用法1）It is +形容词to do…. 表示“干某事是…”。
我们通常在口语或者写作中使用这个句型，对于初中的学生来说，十分有必要熟练地掌握好这个句型，它有利于我们在写作中写出结构比较复杂的句子，从而得到较高分数。
例如：1. It's very important to study English well. 学好英语很重要。
2. It is difficult to finish the work today. 今天完成工作太困难了。
3. It's good to eat fruits. 吃水果好。
4. It's right to read English every day. 每天读英语是对的。
5. It's interesting to play soccer. 踢足球是有趣的。
2）即学即练1.It_________ take a bus to go to school.A.is convinientB.is convinient toC.are convinient toD.are convinient2. It is ___________ the old man.A.good to helpingB.good helpC.good to helpD.to help3.It to smoke.A. are badB.is bad toC.is badD.are bad to4.It _____________ see that movie.A. are thrillingB.is thrilling toC.is thrillingD.are thrilling to5.It _______________ go fishing.A. are excitingB. are exciting toC.is excitingD. is exciting to6.It is interesting to play computer games.A. are interestingB. are interesting toC.is interestingD. is interesting to3) 英译汉1.It is safe to take a bus.2.It is funny to watch movies.3.It is possible to see him now.4.It is dangerous to play with a snake.5.It is diffcult to write a English composition(作文).6.It is wonderful to go fishing with my father.7.It is boring to listen to a same song again and again(反复).8.It is hard to be successful man.9.It is pleasant to come back to my hometown.10.It is horrible to see this bad man.4）课后作业1.熟记下列词组difficult to fall asleep 难以入睡easy to read 容易读impossible to find 不可能找到possible to get there 可能到那里nice to live 适合居住safe to live 住起来安全difficult to understand 难以理解pleasant to visit 参观起来令人开心boring to listen to 听起来枯燥hard to plant 难以种植easy to learn易学wonderful to watch 看起来很棒2.巩固复习：根据所给的形容词填空bad, difficult, ill, asleep, impossible1.Mother：Honey！It is too late. You should fall ________now. Son: It is ___________to sleep tonight. I feel __________. Mother: Oh, you looks ________. It is so late, it is ________to take you to the hospital.awake, safe, happy, nice, alone2. Mary:Hello! Are you __________? Lily:Hello! Yes, I am.Mary: Do you like you new house?Lily: Oh, yes. It is ________ to live. But it keep me ______. Mary:You are not __________.Lily:That’s right. But I like it, beause it is _______ to live here.。
It 的 13 个常用句型及其运用!书面表达必备!
It 的13 个常用句型及其运用！书面表达必备！It 的13 个常用句型及其运用it 虽然并不显眼，但只要运用得当，也能在书面表达中发挥出巨大的作用，给人以高大上的感觉。
本文在归纳其常用的句式结构的基础上着眼于在书面表达中如何恰当地运用it 的相关句型，以达到优化句子，增加文章亮点。
01一、it 句型的归纳：( 一) it 作形式主语的 6 个句型句型1. It is + adj. (=of n.) + for sb. to do sth. / that... 某人做某事是……的。
Will it be convenient for you to start work tomorrow? 你明天开始工作方便吗?It is vital /of great significance for students to take regular exercise. = It is vital /of great significance that students should take regular exercise. 定期进行锻炼这对学生来说太重要了。
句型2. It is a shame / pity that... 很遗憾……(1) It is a shame that some students should scribble and litterrandomly on the campus. 一些学生竟然在校园中乱涂乱画，乱扔垃圾，这真是太不应该了。
(2) It is a pity that I cannot go to see the movie on Saturday evening. 很遗憾，周六晚上我没办法陪您去看电影了。
说明： that 引导的从句为主语从句，从句中谓语动词的语气分两种情况：①表述的内容是事实，用陈述语气 , 如例句 (2) ；②若内容表明说话人的一种语气 / 情感则使用虚拟语气 , 如例句 (1) 。
it's的用法句型
it's的用法句型一、什么是 "it's" 的简单句用法在英语中，"it's" 是 "it is" 的缩写形式，用来表示第三人称单数的主语。
它通常位于主语之后，帮助说明或描述主语。
以下是几种常见的句型和用法：1. 描述天气情况"It's cold outside."（外面很冷。
）"It's sunny today."（今天阳光明媚。
）"It's raining heavily."（下大雨。
）2. 表达时间和日期"It's five o'clock now."（现在是五点钟。
）"It's Monday today."（今天是星期一。
）3. 展示感觉和状态"It's amazing!"（真是太棒了！）"It's difficult to understand."（难以理解。
）"It's my pleasure to help you."（我很愿意帮你。
）4. 表达持有某种观点"I think it's a great idea."（我认为这是个好主意。
）"It's important to take care of our environment."（保护环境很重要。
）5. 强调具体对象或事物"It's the book I've been looking for." （这就是我一直在找的那本书。
）"Is this your car? No, it's mine." （这是你的车吗？不，这是我的。
it is的用法句型
it is的用法句型一、概述在英语中，it is是一个常见的句型，用于强调或提供额外的信息。
它可以用来引入一个事实、提供解释、指明方向、强调感受或陈述观点。
本文将详细介绍it is句型的不同用法，并通过例句加以说明。
二、引入事实1. 用于陈述天气情况It is raining heavily outside.（外面下着大雨。
）It is sunny and warm today.（今天阳光明媚温暖。
）2. 用于描述时间和地点It is 10 o'clock now.（现在是十点钟。
）The meeting will be held at the conference center tomorrow morning. It is where we have our weekly team meeting.（会议将于明天早上在会议中心举行，那是我们每周团队会议的地方。
）三、提供解释1. 解释某个问题的原因或结果I can't join the party tonight because it is my sister's birthday and we are celebratingat home.（我今晚不能参加聚会，因为今天是我妹妹的生日，我们要在家里庆祝。
）He failed the exam because it was too difficult and he didn't study enough.（他考试不及格是因为题目太难了，而且他没有学够。
）2. 对前面提到的词进行解释或替代I bought a new car. It is red and has leather seats.（我买了一辆新车。
它是红色的，有皮座椅。
）She has a cat. It is very cute and playful.（她养了一只猫。
它非常可爱和活泼。
）四、指明方向或位置1. 用于描述事物的方位The supermarket is just around the corner. It is on the left side of the street.（超市就在拐角处。
it is 用法
it is 用法It is是英语中常用的一个词组，可以表示“它是”、“这是”、“那是”，还可以用来指代指定的事物、情况、状态等。
在英语语法中，它有着丰富的用法和意义，在此我们简要介绍它的主要用法。
一、作为主语It is作为主语表示“它是……”，指代的是很多事物中的一个。
比如：1. It is a beautiful day today. （今天天气真好。
）2. It is important to keep a healthy lifestyle. （保持健康的生活方式很重要。
）3. It is clear that he is not telling the truth. （很明显，他没有说真话。
）4. It is hard to believe that she is already 60 years old.（难以相信她已经60岁了。
）5. It is necessary to finish the project on time. （必须按时完成这个项目。
）二、作为宾语It is作为宾语通常用于被动语态、强调句型和插入语等中，其意义不仅仅是指“它是……”，还包括其他意义。
1. 被动语态：It + is + V-edIt is said that he is the best candidate for the job. （据说他是这个工作的最佳人选。
）2. 强调句型：It is …… that …It is John who broke the vase, not Mary. （是约翰打碎了花瓶，不是玛丽。
）3. 插入语：It is …… that ……It is true that you need more practice. （确实你需要多练习。
）三、作为代词It还可以作为代词，泛指事实、情况、状况等。
1. It is difficult to say. （很难说。
）2. It is common knowledge. （常识）3. It is a fact that he has been promoted. （他已经被提升是一件事实。
itis的用法句型
itis的用法句型一、什么是IT IS句型？IT IS句型是英语中常用的一种句法结构，用于强调某个特定的事物或情况。
由于其灵活性和便捷性，在日常英语交流中被广泛使用。
这种句型以"It is"开头，后接形式多样的补充说明，可以突出需要强调的部分。
二、IT IS句型的基本形式1. It is (adj) that…这个形式强调主语所具有的某种特征或性质。
例：It is important that we take care of our environment.2. It is (不定式/动名词) to…这个形式强调行为或动作的重要性或必要性。
例：It is essential to have a good night's sleep.3. It is (adj) of sb to do sth这个形式强调某人做了某事所展现出来的特点。
例：It is kind of John to help his friend in need.4. It is no use (doing sth)这个形式表达某种行为没有效果或没有意义。
例：It is no use crying over spilled milk.5. It is high time (that…)该形式表示现在是做某事的最佳时机。
例：It is high time you started thinking about your future.三、IT IS句型的应用实例1. 重要性首先，让我们来看看第一种形式的应用举例。
我们经常使用"It is (adj) that"的句型来强调某个事物或情况的重要性。
It is crucial that we protect our environment. 保护环境至关重要。
It is vital that we improve our communication skills. 提升沟通技巧至关重要。
itis句型
It is 句型It is 句型1. It is + 被强调部分+ that ...该句型是强调句型。
将被强调的部分放在前面，其它部分置于that之后。
被强调部分可以是主语，宾语，表语或状语。
强调的主语如果是人，that可以由who换用。
如果把这种句型结构划掉后，应该是一个完整无缺的句子。
这也是判断强调句型与其它从句的方法。
It was about 600 years ago that the first clock with a face and an hour hand was made.It was they that (who ) cleaned the classroom yesterday. It was in the street that I met her father.2. It is not until + 被强调部分+ that ...该句型也是强调句型。
主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是not ... until ... 的强调形式。
It was not until she took off her dark glasses that I realizedshe was a famous film star.= Not until she took off her dark glasses did I realize she was a famous film star.= I didn’t realize she was a famous f ilm star until she took off her dark glasses.3. It is clear ( obvious, true, possible, certain....) that .....该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂是主语从句最常见的一种结构。
句型It-is-+-adj.-+-to-do
It is + adj. + of sb. + to do
It was very kind of you to do so. 你这么做真是太好了。
用 于 这 一 句 型 的 形 容 词 有 clever ， considerate ， foolish ，
honest ， impolite ， kind ， lazy ， naughty ， nice ， rude ， silly，wise ，wrong 等，其共同点都表示人物性格、特点，并且 可以改写为：sb. is + adj. + to do的句型。
Comments
it在此句中充当形式主语，指代句中“to do”不定式内 容。
It is + adj.+ (for sb.) + to do
用于这一句型的形容词仅限于如下几个：easy, difficult, hard, necessary, impossible, unnecessary, important 等，其共同点都表示客观情况，并且不能改写为：sb. + is + adj. + to do的句型。
你及时赶到那儿是很重要的。
2) It is difficult for a foreigner to learn Chinese.
外国人学汉语是困难的。
3) It was very kind of you to say so.
你这么说真是太好了。
4) It’s wise of him to do it.
在人生的这一阶段，找一个能促进未来事业的暑期工作很重 要。
“It”在此句中充当形式主语，指代句中to do不定式的内容 。 句型辨析： It is + adj.+ (for sb.) + to do It is important for you to get there in time. 你及时赶到那儿是பைடு நூலகம்重要的。 用于这一句型的形容词仅限于如下几个：easy，difficult， hard，necessary，impossible，unnecessary，important 等。 其共同点都表示客观情况，并且不能改写为：sb. is + adj. + to do 的句型。
itis的用法句型
itis的用法句型
"it is" 是一个常用的句型，可以用于多种情况。
以下是一些常见的用法：
1.描述状态或情况：
- It is raining outside.（外面正在下雨）
- It is hot today.（今天很热）
- It is late.（现在很晚了）
2.表达时间或日期：
- What day is it today? - It is Monday.（今天是星期几？ - 今天是星期一）
3.表达性别或年龄：
- Is the baby a boy or a girl? - It is a girl.（婴儿是男孩还是女孩？ - 是个女孩）
- How old is your dog? - It is 3 years old.（你的狗多大了？- 三岁）
4.强调特定的事物或事件：
- It is important to be kind to others.（待人友善很重要）
- It is nice to meet you.（很高兴见到你）
- It is a beautiful day for a picnic.（今天是个适合野餐的好天气）
5.表达意见或评价：
- It is good to see you again.（很高兴再次见到你）
这只是一些常见用法，"it is" 还可以用于其他情况，具体用法会根据语境而变化。
it is后面加什么词性
形容词或者名词都可以，再高级一点，加从句也可以。
例：It is a dog.It is beautiful.It is exactly what I want.这正是我所需要的。
另外It is.that.也可以表示强调句。
It is my pen that provides me more chances to win the game正是我的这把钢笔，给我提供了更多机会赢得比赛。
It is 可用于强调句、定语从句、主语从句等多种句型，举例如下：一、It is(was)⋯⋯that⋯⋯句型,It is+被强调成分+that+句子剩余部分（强调句）可以分别用来强调主语、宾语、地点状语和时间状语。
如：It was he who(that)read three books in the library yesterday.(强调主语)是他昨天在图书馆读了三本书。
It was in the library that he read three books yesterday.(强调地点状语)他昨天是在图书馆里读了三本书。
二、It is+名词+定语从句It was the day my grandmother was angry.那一天我外婆生气了。
三、It is +名词/形容词+不定式主语It做形式主语，句子真正的主语是不定式。
It was a pleasure to draw pictures.画画是一种享受。
四、It is + no use+动名词主语It做形式主语，句子真正的主语是动名词。
It is no use doing what you like;you have got to like what you do.做你喜欢的事是没有用的；你必须喜欢你做的事。
五、It is +名词/形容词+主语从句It做形式主语，句子真正的主语是主语从句。
如：It was inevitable that the scent of flowers always reminded him of past events.这是不可避免的：花的味道总是让他想起过去的往事。
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It is ... that/since/before等句型归纳••••1. 为了突出或强调句中的某一成分以加强语气,英语中通常用“It is +被强调成分+ that/who”结构，这一结构叫作强调结构。
该结构中的It •是无人崐••••称主语,没有词汇意义,仅起到改变句子结构,使某一成分受到强调的作用。
如被崐••••强调的是物，用that;如被强调的是人,用who,也可用that。
••••强调结构中被强调的成分通常是句中的主语、宾语、地点状语或时间状语。
例如下面一句, 我们可分别对其不同成分进行强调：John wore a white suit at the dance last night.1.It was John that/who wore a white suit at the dance last night.（强调主语）2. It was a white suit that John wore at the dance last night. (强调宾语）3. It was at the dance that John wore a white suit last night. (强调地点状语）4. It was last night that John wore a white suit at the dance.（强调时间状语）••••强调结构亦可用来强调某些状语从句：It was because he was ill that he didn't come to school yesterday.（强调because 引导的原因状语从句）It was only when the war was over in 1949 that he was able to get back home.(强调when 引导的时间状语从句）It was not until his father came back that he went to bed. (强调until引导的时间状语从句）••••现谈谈强调结构中值得注意的几个问题：••••一. 强调结构中的时态问题••••如果被强调的成分，原句谓语动词是一般现在时或一般将来时，强调结构用Itis...that/who; 如果原句的谓语动词是过去时态，则用• It was...that/who; 有时还可用be 的其它形式。
例如：It is the people who/that are really powerful.It was in the street that I met your brother yesterday.It must be your mother who you are thinking of.••••二. 强调结构中代词的格和谓语人称与数的问题••••如果被强调的部分是原句的主语, that/who 后面的谓语在人称和数上均应与原句主语一致, 不与it 一致。
例如：It is you that/who are to blame.It is I that am mistaken.••••一般说来, 强调主格人称代词就用主格, 强调宾格人称代词就用宾格, 但有时被强调的格与原句中的格不一致。
例如：I met her in the street this morning.It was her that I met in the street this morning.her 在原句中是met 的宾语, 所以被强调时仍用宾格形式, 但也可用主格she 替换her。
例如：It was she that I met in the street this morning.••••这时, 说话者遵循传统语法, 认为动词be 后面的代词用主格,•而不管这个代词在原句中究竟是主格还是宾格。
••••强调主格时也有两种情况, 尤其是在非正式的口语中常用宾格代替主格。
例如：They saved the drowning girl.It was they who saved the drowning girl.It was them who saved the drowning girl.••••三. 强调结构中的一般疑问句和特殊疑问句问题••••一般疑问句只需将"It" 与"is/was" 交换位置即可。
例如：Was it you that broke the window?Was it here that you met him?••••如强调疑问句, 需将疑问词置于句首：Who was it that called him "comrade"?What is it that you are going to do?When is it that they will leave?••••四. 强调结构中的that/who 在口语中常可省略：It was you I thought of all the time.It is here he must come.It was John I gave the book to.Was it in Chengdu you first met him?What is it you want me to do?五. 注意固定言语中的意思：It is a wise father that knows his own child.聪明的父亲往往也不了解自己的儿子。
It is a long lane that has no turning. 胡同不管怎样长，总是要拐弯的。
（天无绝人之路）It is a long night that never finds the day. 漫漫长夜，总有拂晓时。
It is a silly fish that is caught twice. 任何鱼都不会愚蠢到上两次钩。
2．It is (high) time that…该句型中的that可省略，从句谓语通常是动词的过去式，也可用should + 动词原形。
相当于It is time for sb. to do sth.例如：It is time that we went to school.It is time I ought to leave now.It’s high time that we should put an end to the controver sy.3．It is + n.+ that…该句型为主语从句。
It为形式主语，真正的主语是that引导的从句。
例如：It is a pity that you didn’t see the film yesterday.It is a wonder that he refused such a good offer.It is common knowledge that the traffic situation there is deplorable.用于该句型的名词常见有：common knowledge, common sense, a good thing, an honor, a mercy, a pity, a pleasure, a shame, a surprise, a wonder等。
4．It is + adj.+ that…该句型为主语从句。
It为形式主语，真正的主语也是由that引导的从句。
例如：It is certain that we shall be late.It’s strange that he didn’t come yesterday.Isn’t it strange that the lazy boy (should) pass the exam.能用于该句型的形容词常见的有：certain, clear, curious, disappointing, dreadful, fit, fortunate, frightening, funny, good, important, lucky, natural, necessary, obvious, peculiar, pleasing, possible, probable, proper, right, sad, surprising, remarkable, unfortunate, unimportant, unnecessary, unusual, useless, well, wonderful, wrong, true等。
that从句可用陈述语气，也可用should + 动词原型的虚拟语气形式。
用陈述语气表示客观事实；用虚拟语气表示惊讶、喜悦、遗憾、失望等感情色彩或表示要求、建议、命令、愿望等。
5．It is + p.p. + that…该句型为主语从句。
It为形式主语，真正的主语是that引导的从句。
例如：It was said that Mr. White had been writing a new TV play.It is reported that the sports meet has been put off.It has not been decided that when and where we ill hold the meeting.能用于该句型的过去分词常见的有：admitted, announced, believed, decided, demanded, disclosed, expected, found, hoped, reported, requested, said, seen, suggested, thought, told, unknown,等。
6．It is…before…该句型的is后可接long或一段时间。
肯定句译为“过多久…才…”；否定句译为“没多久…就…”。
例如：It was a long time before I got to sleep again.It will be hours before he arrives here.It was not long before he left his home town.It will be five years before we meet again.It wasn’t long before he told us about this affair.It was evening before we reached the little town.7．It is … since…该句型表达“从……以来已经多久了”的意思。