“it”用法总结(经典版)
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3). It is necessary ( for sb. ) to do sth. 常见的形容词有：① important， necessary， natural ② easy ， safe ，common ，normal ，hard ， difficult ,dangerous ， 等。 在①中的形容词作表语可以用从句改写， 如： It is important for her to come to the party. = It is important that she (should ) come to the party.
2.2.指时间: It was nearly midnight when she came back.
2.3.指环境: It was very quiet in the café.
2.4.指距离： It is half an hour’s walk to the city centre.
三 强调句1. It is + 被强调部分 + that ...
主句中的过去分词是表示请求，建议，命令等词时，that 后的从句要用虚拟语气（should + 动词原形），should 可以省；常译为“据建议；有命令．．．）
It is suggested that the meeting ( should ) be put off.
3）. It is a pity ( a shame ... ) that ... that后的从句一般用虚拟语气（should + 动词原形）， should可省去．表示出乎意料，常译为“竟然”。没有 这种意义时，则不用虚拟语气。
1) It was ten o'clock when we got home last night．我们昨晚到家时已十 点了。 2) It was at ten o'clock that we got home last night．我们昨晚是在十 点到家的。
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 realized she 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 film star until she took off her dark glasses.
③被强调部分为人时，可用who(主格或宾格)和 whom(宾格)代替that，用that也行。
1) It was your father that/whom /who I met in the street yesterday．
2) It was I that/who met your father in the street yesterday．
5). It happens (seems， looks， appears ) that... 该句型中it是形式主语，that 引导的是主语从句，主句 中的happen ， seem等词是不及物动词。
It happened ( so happened ) that he met his teacher in the street. 碰巧．．. It seems that he will be back in a few days. 看 来．．． 6）定语从句中的形式主语 The man whose business it is to look after the children is not here. Those were the graduate assistants whose responsibility it was to do the research work in the lab.
六、特殊句型 1). It is .... since ...。 It is ( has been ) 5 years since his father died.
2). It is ... when ...。 “当．．．的时候，是．．．” It was 5 o’clock when he came here.
㈠ 1.it作人称代词
1.4.it 指未知的人。 A 有人敲门 There’s a knock at the door. Who is it? It’s the milkman. B 在电话里 “Oh, by the way, there was telephone call for you?” –Who was it?
四 it 用作形式主语
3.1 代替主语从句
1）It is + adj. +that从句
① It is clear ( obvious， true， possible certain....) that ..... “清楚（显然，真的，肯定．．．）”
It is very clear that he’s round and tall like a tree.
ห้องสมุดไป่ตู้使用该句型有以下几点请注意： ① 强调句的谓语is或was永远用单数.
It was yesterday that I met your father in the street．
②不管被强调部分是哪种状语，只能用 that连接，不得使用where、when等连词.
It was in the street that I met your father yesterday．
It is time that children went to bed.
② It is the first ( second ... ) time that ... “是第一（二）．．．次．．．”。
It is the first time I have been here. = This is the first time I have been here.
We think it our duty to clean our classroom every
day.
He felt it important learning English well.
They found it difficult that they would finish their
work in two days.
3.2.作形式主语替代不定式
1). It takes sb. ... to do sth. ＂做．．．要花费某人．．＂ It took thousands of people many years to build the Great Wall.
2). It is kind ( of sb. ) to do sth. 主句中的形容词必须是能表示逻辑主语特征的形容词。 常见的有： bad ， brave ， careless， clever ， cruel ， foolish ，stupid ， wise wrong等。 这个句型可以改写为：sb. is kind to do sth. 。 It is kind of you to say so. = You are kind to say so.
㈠ 1.it作人称代词
1.1.it的最基本用法是作人称代词，主要指刚提到 的事物，以避免重复: Tai’an is a beautiful city, isn’t it?
1.2.也可以指动物或婴儿(未知性别的婴儿或孩子): Is this your dog？No, it isn’t.
1.3.也可指抽象事物: It was a great surprise to me when he did a thing like that．
3). It be ... before ... 该句型主句中的 it 指时间， 主句中的时态常是一般将来时或过去 时两种时态．主句中的表语多是long， not long ， 3 days ， 2 weeks 等表示时间段的词或短语。
3.3.作形式主语替代ing形式
It is no good (use ) doing sth. 该句型中的真正主语是动名词短语，主句中的表 语可以是no good ， ( not any good ) ， no use ( not any use ), a waste of time等
It is no good learning English without speaking English. It's useless trying to argue with Shylock.
2）.It is +v-ed +that 从句 ① It is said (reported， learned....) that ...
据说（据报道，据悉．．．）“。 It is said that he has come to Beijing.
②. It is suggested ( ordered /demanded/insisted/commanded... ) that ...
④强调句中 也要注意主谓一致、人称一致和否定转移 的问题。
It is they who are our friends． It was not until ten o'clock that we got home last night．
要点点拔
第一句不是强调句，when不可改为 that,因为去掉it was和that后，只能组成 ⑤w组“这注a成意W样s一不…e一个要gt个ho完混at不t整h淆…o完的强m为整句调e强的子句t调e，句n和句只o其子标'c是他；志lo没从c，第k被句去二l强a。掉s句调It后t是n,i而仍isg强其h可t调．” 他 比句从较，句：th一at般不不可具改备为这w一h特en征．。
C 确认某人为何人 Her face lighted when she saw who it was.
二.非人称代词it
it有时并不指具体的东西，而泛指天气、时间、环境等， 称为非人称的it： 2.1.指天气： It is a lovely day, isn’t it? It is a bit windy.
五 It 作形式宾语.
We think it important to learn a foreign language. 该句型中的it 作形式宾语，为了记忆方便我们可称该句型 为"6123结构"。 6指主句中常用的动词： think,believe,make,find,consider,feel； 1指的是形式宾语it； 2指的是宾补的两种形式：形容词或名词； 3指的是真正宾语的三种形式：不定式短语，动名词短语 或that引导的宾语从句。
②. It is important ( necessary， right， strange， natural...) that ... that 后的从句中要用虚拟语气（should + 动词原形）， should 可以省去，建议记住该句型中的形容词。 It is important that we (should) learn English well.
It is a pity that such a thing ( should ) happen in your class. It is a pity that he is ill.
4).① It is time ( about time ，high time ) that ... 该句型中that 后的从句应该用虚拟语气，值得注意的是 常用过去时态表示虚拟．常译为＂是（正是）．．．的时 侯．．．＂
2.2.指时间: It was nearly midnight when she came back.
2.3.指环境: It was very quiet in the café.
2.4.指距离： It is half an hour’s walk to the city centre.
三 强调句1. It is + 被强调部分 + that ...
主句中的过去分词是表示请求，建议，命令等词时，that 后的从句要用虚拟语气（should + 动词原形），should 可以省；常译为“据建议；有命令．．．）
It is suggested that the meeting ( should ) be put off.
3）. It is a pity ( a shame ... ) that ... that后的从句一般用虚拟语气（should + 动词原形）， should可省去．表示出乎意料，常译为“竟然”。没有 这种意义时，则不用虚拟语气。
1) It was ten o'clock when we got home last night．我们昨晚到家时已十 点了。 2) It was at ten o'clock that we got home last night．我们昨晚是在十 点到家的。
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 realized she 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 film star until she took off her dark glasses.
③被强调部分为人时，可用who(主格或宾格)和 whom(宾格)代替that，用that也行。
1) It was your father that/whom /who I met in the street yesterday．
2) It was I that/who met your father in the street yesterday．
5). It happens (seems， looks， appears ) that... 该句型中it是形式主语，that 引导的是主语从句，主句 中的happen ， seem等词是不及物动词。
It happened ( so happened ) that he met his teacher in the street. 碰巧．．. It seems that he will be back in a few days. 看 来．．． 6）定语从句中的形式主语 The man whose business it is to look after the children is not here. Those were the graduate assistants whose responsibility it was to do the research work in the lab.
六、特殊句型 1). It is .... since ...。 It is ( has been ) 5 years since his father died.
2). It is ... when ...。 “当．．．的时候，是．．．” It was 5 o’clock when he came here.
㈠ 1.it作人称代词
1.4.it 指未知的人。 A 有人敲门 There’s a knock at the door. Who is it? It’s the milkman. B 在电话里 “Oh, by the way, there was telephone call for you?” –Who was it?
四 it 用作形式主语
3.1 代替主语从句
1）It is + adj. +that从句
① It is clear ( obvious， true， possible certain....) that ..... “清楚（显然，真的，肯定．．．）”
It is very clear that he’s round and tall like a tree.
ห้องสมุดไป่ตู้使用该句型有以下几点请注意： ① 强调句的谓语is或was永远用单数.
It was yesterday that I met your father in the street．
②不管被强调部分是哪种状语，只能用 that连接，不得使用where、when等连词.
It was in the street that I met your father yesterday．
It is time that children went to bed.
② It is the first ( second ... ) time that ... “是第一（二）．．．次．．．”。
It is the first time I have been here. = This is the first time I have been here.
We think it our duty to clean our classroom every
day.
He felt it important learning English well.
They found it difficult that they would finish their
work in two days.
3.2.作形式主语替代不定式
1). It takes sb. ... to do sth. ＂做．．．要花费某人．．＂ It took thousands of people many years to build the Great Wall.
2). It is kind ( of sb. ) to do sth. 主句中的形容词必须是能表示逻辑主语特征的形容词。 常见的有： bad ， brave ， careless， clever ， cruel ， foolish ，stupid ， wise wrong等。 这个句型可以改写为：sb. is kind to do sth. 。 It is kind of you to say so. = You are kind to say so.
㈠ 1.it作人称代词
1.1.it的最基本用法是作人称代词，主要指刚提到 的事物，以避免重复: Tai’an is a beautiful city, isn’t it?
1.2.也可以指动物或婴儿(未知性别的婴儿或孩子): Is this your dog？No, it isn’t.
1.3.也可指抽象事物: It was a great surprise to me when he did a thing like that．
3). It be ... before ... 该句型主句中的 it 指时间， 主句中的时态常是一般将来时或过去 时两种时态．主句中的表语多是long， not long ， 3 days ， 2 weeks 等表示时间段的词或短语。
3.3.作形式主语替代ing形式
It is no good (use ) doing sth. 该句型中的真正主语是动名词短语，主句中的表 语可以是no good ， ( not any good ) ， no use ( not any use ), a waste of time等
It is no good learning English without speaking English. It's useless trying to argue with Shylock.
2）.It is +v-ed +that 从句 ① It is said (reported， learned....) that ...
据说（据报道，据悉．．．）“。 It is said that he has come to Beijing.
②. It is suggested ( ordered /demanded/insisted/commanded... ) that ...
④强调句中 也要注意主谓一致、人称一致和否定转移 的问题。
It is they who are our friends． It was not until ten o'clock that we got home last night．
要点点拔
第一句不是强调句，when不可改为 that,因为去掉it was和that后，只能组成 ⑤w组“这注a成意W样s一不…e一个要gt个ho完混at不t整h淆…o完的强m为整句调e强的子句t调e，句n和句只o其子标'c是他；志lo没从c，第k被句去二l强a。掉s句调It后t是n,i而仍isg强其h可t调．” 他 比句从较，句：th一at般不不可具改备为这w一h特en征．。
C 确认某人为何人 Her face lighted when she saw who it was.
二.非人称代词it
it有时并不指具体的东西，而泛指天气、时间、环境等， 称为非人称的it： 2.1.指天气： It is a lovely day, isn’t it? It is a bit windy.
五 It 作形式宾语.
We think it important to learn a foreign language. 该句型中的it 作形式宾语，为了记忆方便我们可称该句型 为"6123结构"。 6指主句中常用的动词： think,believe,make,find,consider,feel； 1指的是形式宾语it； 2指的是宾补的两种形式：形容词或名词； 3指的是真正宾语的三种形式：不定式短语，动名词短语 或that引导的宾语从句。
②. It is important ( necessary， right， strange， natural...) that ... that 后的从句中要用虚拟语气（should + 动词原形）， should 可以省去，建议记住该句型中的形容词。 It is important that we (should) learn English well.
It is a pity that such a thing ( should ) happen in your class. It is a pity that he is ill.
4).① It is time ( about time ，high time ) that ... 该句型中that 后的从句应该用虚拟语气，值得注意的是 常用过去时态表示虚拟．常译为＂是（正是）．．．的时 侯．．．＂