英语三大从句中that省略情况小结
宾语从句省略that形式-高考英语知识点
宾语从句省略that形式-高考英语知识点宾语从句省略that形式1.宾语从句
置于动词、介词等词性后面起宾语作用的从句叫宾语从句。
宾语从句的语序必须是陈述语序。
谓语动词、介词、动词不定式，v.-ing形式后面都能带宾语从句。
有些形容词（afraid,sure,glad等）之后也可以带宾语从句。
2.宾语从句that不能省略的情况
当句中的动词后接多于两个由that引导的宾语从句时，第一个that 可省，但后面的that不可省。
当主句的谓语动词与that宾语从句之间有插入语时，that一般不可省。
当that从句是双宾语中的直接宾语时，that不可省。
宾语从句中引导词的省略和替代技巧
宾语从句中引导词的省略和替代技巧在英语语法中，宾语从句是由一个引导词引导的从句，该从句作为动词的宾语。
然而，在实际的交流中，我们有时可以省略或替代宾语从句中的引导词，以简化语句结构或更加自然地表达意思。
本文将介绍宾语从句中引导词的省略和替代技巧。
一、省略引导词的情况1. “that” 的省略：在宾语从句中，如果引导词是“that”，且从句中的主语是句子的主语，则可以将“that”省略。
例如：- She said (that) she was tired.- He believes (that) they will win the game.2. “whether” 的省略：在宾语从句中，如果引导词是“whether”，且从句中的主语是动词的主语，则可以将“whether”省略。
例如：- He asked (whether) she had finished her homework.- I don't know (whether) they will come to the party.3. “if” 的省略：在宾语从句中，如果引导词是“if”，且从句中的主语是动词的主语，则可以将“if”省略。
例如：- He wonders (if) she is happy.- I doubt (if) it will rain tomorrow.二、替代引导词的情况1. “that” 的替代：在宾语从句中，除了直接省略“that”之外，还可以使用一些代替词来引导宾语从句，例如“whether”和“if”。
例如：- She wonders whether she should go to the party.- He asked if she had seen the movie.2. “what” 的替代：当宾语从句中的内容具体表示某事物或事实时，可以用“what”来替代整个从句。
例如：- I don't know what time it is.（我不知道现在是几点。
THAT什么时候可以省略
THAT什么时候可以省略?标签：省略is语法回答：2 浏览：3247 提问时间：2007-06-02 12:29The reason for that is that .................如果语法没错的话,那么THAT可以去掉么?推荐资料:化学版青花瓷.mp3更多"青花瓷"相关资料>>最佳答案此答案由提问者自己选择，并不代表爱问知识人的观点揪错┆评论有来无回[文曲星]宾语从句中that一般情况可省,但也并不是任何情况下都可以省略。
具体如下：宾语从句1．定义：用作宾语的从句叫宾语从句。
2．构成：关联词+简单句从属连词that。
如：He told us that he felt ill. 他对我们说他感到不舒服。
I know he has returned. 我知道他已经回来了。
(that省略)注:宾语从句中that一般情况可省,但that在引导宾语从句时也并不是任何情况下都可以省略。
在以下情况下，that不能省略。
1．Everybody could see what happened and that Tom was frightened.(and连接两个宾语从句，that宾语从句放在and的后面时，that不能省略。
)大家都会看出所发生的事情并知道Tom非常害怕。
2．I know nothing about him except that he is from the south.(that引导的宾语从句作介词宾语时，that 不能省略。
)对他我一无所知，只知道他是南方人。
3．That he ever said such a thing I simply don’t believe. (that从句位于句首时，that不可省略。
)我简直不相信他曾说过这样的话。
4．We decided, in view of his special circumstances, that we would admit him for a probationary perio d. (主句谓语动词与that从句之间有插入语，that不可省略。
英语记趣关系词that的省略
题图：一缕阳光十分娇嗔关系词that在口语或书面语中的省略现象屡见不鲜。
归纳起来，大致有以下几种：1. 关系代词that在句中作主语时可以省略(1) 当句子以who、what等疑问代词开头时that可以省略。
如：What is the stuff about the door (that) swings both ways?在门上摇来晃去的是个什么东西？Who was the man (that) called on you a moment ago?刚才来拜访你的那个人是谁？(2) 当关系代词that后面紧跟了ever，其前的先行词被first、only、last等词或形容词最高级修饰时that可以省略。
如：She was the first woman (that was) ever climbed Mt. Qomolangma.她是登上珠穆朗玛峰的第一位妇女。
He is the bravest man (that) ever breathed.他是空前的勇士。
It was the strangest sight (that was) ever seen.这奇观是罕见的。
(3) 在I think、I feel、I know、he believes等插入语前作主语的关系代词that也可省略。
如：They’ve worked out a new plan (that) he believed is practical.他们制订出了一个新计划，这个计划他认为是切实可行的。
He stopped his son from doing things (that) he thought were wrong.他不让他的儿子干他认为是错误的事情。
(4) 在there、here、it、that等词开头的句子中关系代词that可以省略。
如：There was a man (that) came (who) said that he bought many different magazines.有个人进来说过他买了各种杂志。
that引导宾语从句时不可省略的情况
3.当动词后跟有复合宾语结构时， it作形式宾语，that从句作真正 宾语，引导词that不可省略。 e.g. I added it that we should be aware of the dangers before taking the order.
4.当动词和that从句之间有插入语或 者主句的状语时，that不可省略 e.g. We learned at school that everything we see and touch is matter.
5.当that从句的状语紧跟在that之 后时，that不可省略。例如： • They told us that once again the situation was serious. • 试比较：They told us once again that the situation was serious.
that引导宾语从句时 不可省略的情况
1、在英式英语中动词
add, agree, announce, argue, assume, complain, decide, hold, indicate, insist, intend, learn, promise, point out, remark, suggest, state等之后的宾语从 句的引导词that需保留。 e.g. I agree that we should be here on time.
定语从句that不能省略
定语从句that不能省略定语从句that不能省略定语从句that的用法大家了解吗？以下是店铺分享的定语从句that的用法，一起来看看吧！一、定语从句that不能省略情况1.非限制性定语从句中,that有其他意思不可省2.有不定代词时3.有only时4.有序数词时5.指人又指物时6.有形容词最高级时二、定语从句中关系词的省略与不省略1.关系代词which,whom,who,that在定语从句中作宾语时可以省略.Here is the man (who/that/whom)you're been looking for.以下情况不能省略：（1）在介词+whom与介词+which中,whom,which不能省略.Do you know any shops nearby in which I can buy flowers?That is the headmaster with whom my father was talking just now.注：当介词放在动词后时,which,whom就可以省略.Who is the man (whom) you talked with just now?（2）在非限制性定语从句中,作宾语的关系代词也不能省略.Mr Green,whom you know,is the tallest in our school.The elephant is like a spear,as anybody can see.（3）在the same ...as,such...as,as...as,the same...that 中,as,that即使作宾语,也不能省略I have bought the same bicycle as you have (bought).(指同类用as)This is the same book that I read the day beforeyesterday.(that指同一个)（4）当由and,but,or等连词连接两个或两个以上的定语从句修饰一个先行词时,第一个关系代词可省,但第二,第三个不可省略.This is the book (which) I read yesterday and which I find very interesting.2.当that在从句中作补语时可以省略.He is not the man (that) he used to be.She is all (that) a teacher should be.3.在there be 结构中出现定语从句,或在定语从句中出现there be 时,用作主语的关系代词也可省略.There is a man downstairs (who) wants to see you.This is the best dictionary (that) there is in the library.4.状语的省略（1）当先行词是reason,而且定语从句中作原因状语时,关系代词可用why,that,也可以省略.The reason (why/that) he failed was his laziness.That is the reason (why) I did it.（2）当先行词是way,且在定语从句中作方式状语时,关系代词可用in which,that,也可以省略.The way (in which/that) these comrades look at problems is wrong.That was the way (in which/that) she worked the problem out.注意：当关系代词在定语从句中作主语时,不省略.例如：I don't know the way that/ which leads to the top of the mountains.(3)当先行词是time时,关系代词可用when,that 或省略.The second time (that) I saw him was in 1980.I don't know the exact time (when/that) the sports meet will take place.注意：关系代词作宾语有时也不能省略.拓展1同位语从句在复合句中用作同位语的从句叫同位语从句，常常跟在fact,idea,opinion,news,hope,belief等名词后面,用以说明该名词表示的具体内容，可以由名词、代词、短语及句子来充当同位语从句。
宾语从句中that一般情况可省
宾语从句中that一般情况可省 ,但也并不是任何情况下都可以省略。
具体如下：宾语从句1．定义：用作宾语的从句叫宾语从句。
2．构成：关联词+简单句从属连词that。
如：He told us that he felt ill. 他对我们说他感到不舒服。
(that省略)I know he has returned. 我知道他已经回来了。
(that省略)注: 宾语从句中that一般情况可省 ,但that在引导宾语从句时也并不是任何情况下都可以省略。
在以下情况下，that不能省略。
1．Everybody could see what happened and that Tom was frightened. 大家都会看出所发生的事情并知道Tom非常害怕。
解析：and连接两个宾语从句，that宾语从句放在and的后面时，that不能省略。
)2．I know nothing about him except that he is from the south. 对他我一无所知，只知道他是南方人。
解析：that引导的宾语从句作介词宾语时，that不能省略。
3．That he ever said such a thing I simply don’t believe. 我简直不相信他曾说过这样的话。
解析：that从句位于句首时，that不可省略。
4．We decided, in view of his special circumstances, that we would admit him for a probationary period.解析：主句谓语动词与that从句之间有插入语，that不可省略。
That 在英语中是一个使用频率很高的词。
它可用作代词、连词、关系代词等，有时可以省略。
但在以下几种情况下that不可省略。
一、that 用作代词，指上文提到的人或事物 (单数名词)，且需一个后置定语来修饰，此时 that 不可省。
英语中that的用法
英语中that的用法“that”在英文中是一个使用频率很高的单词。
它有四种词性，并且句法及语法功能纷繁复杂。
同学们如果不能熟练掌握其用法，很可能会形成英语学习的一种障碍，从而影响其学习兴趣和效率。
现将that的用法总结归纳如下：第一、that 用作形容词（后接复数名词时用those）。
它用来指已被提到的人或物；也可表对比，指两个中较远的那个。
What about that book you borrowed from me last month？请注意，that 有时候在句子中具有喜欢或轻蔑等感情色彩。
that little son of his 他那个小宝贝儿子That George！乔治那家伙！（含有轻蔑语气）第二、that 用作代词。
1. that 用作指示代词（复数形式是those），其指代意义同形容词用法，同时它还可以用作定语从句中的先行词；还可为了避免重复，代替前述名词。
That is what he told me.What is that (which) you have got in your hand?The price of rice is higher than that of flour.2. that 用作关系代词，引导限制性定语从句。
先行词可人可物，用法相当于who或which。
（但是在下列情况下多用that：先行词既有人又有物时；先行词有形容词最高级、序数词、不定代词、very，only等修饰时；先行词是不定代词时）He talked about the teachers and schools that he had visited.I think it one of the most wonderful films that the film company has ever produced. She has little information that is useful for our research.Is there anything that I can do for you?请注意，that 在定语从句中作宾语时通常可省略。
2016考研英语：三大从句中that省略情况小结
2016考研英语：三大从句中that省略情况小结在考研英语长句阅读中，我们常常会遇到连接词that省略的情况。
而一旦省略，对同学们的从句识别和判定会带来一定的困难，从而影响阅读的理解和翻译。
本文我们就来看一下，三种从句中连接词that省略用法的几种情况。
一、that引导定语从句,在从句中充当成分。
1.that在定语从句中作宾语时，往往可省略。
如：（1）John once talked to his mom about the cities（that）he had visited abroad.在从句中that作visit的宾语，故可以省略。
（2）The homework（that）I finished last night was left at home.在从句中that作finish的宾语，故可以省略。
2.that在定语从句中作主语时，不可省略。
如：（1）The teacherthatis kind to us goesback home very late every day.在从句中that作主语，故不可以省略。
（2）My old schoolthatwas located in the suburban was razed to the ground.在从句中that作主语，故不可以省略。
3.that在引导限定性定语从句时，有时相当于in which, at which, for which或on which,并且在从句中可以省略。
如：（1）Attitudes towards daydreaming are changing in much the same way (that ) (in which) attitudes towards night dreaming have changed.（2）I like the music for the very reason (that ) (for which) he dislike it.（3）We arrived the day (that ) (on which) they left.二、that引导名词性从句时，充当连词，本身无实际意义。
that在从句中的用法小结
that在从句中的用法小结that除了用作指代代词以外，还可以用作连词引导名词性从句、状语从句，用作关系代词，引导定语从句。
其用法如下：一、that用作连词，引导名词性从句。
1. 引导宾语从句，that无实际意义，可省略。
例如：We must remember (that) the enemy will not perish of himself.我们必须记住敌人是不会自行消灭的。
Kitty said (that) she would call again after supper.凯蒂说她晚饭后再来但是，当一个句子很复杂，句中有多个并列的宾语从句时，特别是第一个宾语从句特别长的情况下，后面宾语从句前的that不可省略。
例如：I wish (that) we could go sightseeing in Hangzhou this summer and that we could buy some books in Shanghai on our way back.我希望今年夏天到杭州去玩玩，并在返回的路上到上海买点书。
2. 用于主语从句中，that一般不能省略。
例如：That we need more equipment is quite obvious.我们需要更多的设备，这是很明显的。
That she is still alive is a consolation.她还活着，这是使人感到宽慰的。
（以上两句中的that不能省）有时主语从句较长，这时往往用it作形式主语，而把that从句移后。
例如：It is good you are so considerate.你这么周到是很好的It is certain that they will all eventually turn to socialism.可以肯定他们最后都必将转到社会主义方面来。
3. 用在表语从句中，一般不可省。
例如：His suggestion is that we (should) turn the land into rice fields.他的建议是我们把这片地开发成稻田。
英语三大从句中that省略情况小结
英语三大从句中that省略情况小结第一篇：英语三大从句中that省略情况小结that省略情况小结在英语长句阅读中，我们常常会遇到连接词that省略的情况。
而一旦省略，对同学们的从句识别和判定会带来一定的困难，从而影响阅读的理解和翻译。
本文我们就来看一下，三种从句中连接词that省略用法的几种情况。
一、that引导定语从句,在从句中充当成分。
1.that在定语从句中作宾语时，往往可省略。
如：（1）John once talked to his mom about the cities（that）he had visited abroad.在从句中that作visit的宾语，故可以省略。
（2）The homework（that）I finished last night was left at home.在从句中that作finish的宾语，故可以省略。
2.that在定语从句中作主语时，不可省略。
如：（1）The teacher that is kind to us goes back home very late every day.在从句中that作主语，故不可以省略。
（2）My old school that was located in the suburban was razed to the ground.在从句中that作主语，故不可以省略。
3.that在引导限定性定语从句时，有时相当于in which, at which, for which或on which, 并且在从句中可以省略。
如：二、that引导名词性从句时，充当连词，本身无实际意义。
1.that在引导宾语从句时，通常可省略。
如：We know(that)sound can travel through air.that引导的从句在主句中充当know的宾语，故为宾语从句，此时that可以省略。
但：（1）在介词短语后的宾语从句中that常不可省略，且前面往往有个形式宾语it。
可以省略that的情况
当that作learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时;当宾语从句较长时;当主语状语置于主句尾,宾语从句之前时;当主语谓语动词(包括非谓语动词)与宾语从句之间有插入语时;当一个动词带有两个或两个以上宾语从句时,此时第一个that可以省略,第二个that不可以省略;当宾语从句中的主语是this,that或this,that做主语的定语时;当宾语从句是双宾语中的直接宾语时;当宾语从句的主语是非谓语动词或主语从句时;当主语中的谓语动词是固定词组时;当主语从句有it做其先行词时;在直接引语中,转述分句把宾语从句隔开时.英语语法中很重要的一部分是从句。
从句有分为三种：状语从句定语从句名词性从句（主语从句、表语从句、宾语从句、同位语从句）。
“关于这些的介绍可以到摆渡知道中找，多的是。
”在由that引导的从句中，可以省略的有：定语从句中作宾语时、宾语从句中。
其它的不可以省略，如：定语从句中作主语、同位语从句等。
bu:三、只用that引导和不用that引导的场合1．只用that引导和不用that引导的场合1）当先行词既包括人又包括物时：He talked about the men and the books that attracted him.2）指物的先行词被any, every, only, very, all, no等修饰时：These are the very points that interest me./That´s the only watch that I like most.3）指物的先行词被序数词或形容词最高级修饰时：The first step that we are to take is very difficult./This is the second card that he gave me.4）先行词是指物的不定代词all,little,few,much,及everything,anything,nothing等时：There is still much that can be done about it./Have you got everything that you need?5）先行词是who时：Who that have seen him does not like him?2．不用that的场合如下：1）非限制性定语从句中Last night ,I saw a very good film,which was about the LongMarch .2）介词放在关系代词之前时This is the man from whom I learnt the news3）句中出现了that，或先行词是that时I have found that which I was looking for.。
干货：宾语从句中that省略与否的8种情况（全网首发）
干货：宾语从句中that省略与否的8种情况（全网首发）1.that后接的宾语从句不紧跟动词之后时，即that之后插入一个分句或一个较长的短语时，此时的that不可省略。
《英语语法大全》（伦道夫·夸克等著）第1448页that-分句如果that-分句很简短，零that-分句就尤其常见。
除分句作非外置的主语以外，还有一些情况需要保留that：(4) 在动词和that-分句之间插入了一个分句或一个较长的短语时：We decided, in view of his special circumstances, that we would admit him for a probationary period.《剑桥高级英语语法》（第二版中文版）第72页Unit 33常见的转述动词，如agree, mention, notice, promise, say和think之后常省略that，特别是在非正式口语中。
但是下列情况下，一般不省略that：that-从句不紧跟动词之后时：She agreed with her parents and brothers that it would be safer to buy a car than a motorbike.（而不用…and brothers and it would be safer…）《王国栋国际英语深层语法》第739页（七）在宾语从句中连词that不可省略的4种句型（2）当that引导的宾语从句被插入语等成分分隔而与主句隔开时，不可省略that。
如：Just then I noticed, for the first time, that Monsieur Hamel wore his fine green coat.就在那时，我第一次注意到汉密尔先生穿着他最好的绿西装上衣。
2.宾语从句位于句首——为强调从属连词that引导的及物动词的宾语从句，而将这个宾语从句放置在句子的前部，that不可省略，这时宾语从句的末尾通常要加逗号。
that引导定语从句省略
that引导定语从句省略that引导定语从句省略that常用作关系代词，可指代某人，也可指代某物，指物时有的时候可用which替换that，指人时可用who替换。
但在下列情况下，一般用that。
一、that指代某物事时1.先行词为all, few, little, much, the one, something, anything, everything, nothing等时。
如：（1）We'll do all that we can to protect the endangered plants and animals.我们将尽我们的最大努力来保护那些濒危的动。
(2) There is much that I wan to tell you.我有很多想要告诉你的话。
(3) Is there anything that I can do for you?有我可以帮你的吗？2.先行词被all, every, no, some, any, (a)few, (a)little, much等限定词修饰时。
如：(4) You can borrow any book that you want to read in our school library.在我们图书馆，你可以借任何你想读的书。
3.先行词被序数词或形容词最高级修饰时。
如：（5）This is the most beautiful city that I've ever seen.这是我见过的最漂亮的城市。
4.先行词被the only, the very, the right, the last等修饰时。
如：（6）This is the very factory that they visited last summer holiday.这恰好是他们去年参观的那个工厂。
（7）This is the only painting in this style that we have.这种风格的画我们仅有一幅。
定语从句中that可以省略的情况
定语从句中that可以省略的情况
一、关系代词that在定语从句中作宾语时可以省略。
二、当that在从句中作补语时可以省略。
三、在there be 结构中出现定语从句，或在定语从句中出现there be 时，用作主语的关系代词也可省略。
四、当先行词是reason，way，time做状语时可以省略。
A dash (—) is not the same as a hyphen.The dash,or a pair of dashes,lets you interrupt a sentence to add emphasis with additional e dashes lightly or you risk creating a breathless,overly informal style.
破折号不同于连字号.使用破折号或成对破折,能够让你通过补充信息来重点解释一个句子.使用破折号可以避免句子过长,让人喘不过气来,也可以避免句子过于通俗化.
Use a dash to emphasize an example,a definition,or a contrast.
使用破折号来强调一个范例,一个定义或者一个对比.
Two of the strongest animals in the jungle—the elephant and gorilla—are vegetarians.
森林里的两种最大的动物—大象和大猩猩—都是素食动物.
Two of the strongest animals in the jungle are vegetarians—the elephant and gorilla.
森林里的两种最大的动物都是素食动物—大象和大猩猩.。
可以省略that的情况
当that作learn,suggest,explain,agree,wonder,prove,mean,state,feel,hold等动词的宾语时;当宾语从句较长时;当主语状语置于主句尾,宾语从句之前时;当主语谓语动词(包括非谓语动词)与宾语从句之间有插入语时;当一个动词带有两个或两个以上宾语从句时,此时第一个that可以省略,第二个that不可以省略;当宾语从句中的主语是this,that或this,that做主语的定语时;当宾语从句是双宾语中的直接宾语时;当宾语从句的主语是非谓语动词或主语从句时;当主语中的谓语动词是固定词组时;当主语从句有it做其先行词时;在直接引语中,转述分句把宾语从句隔开时.英语语法中很重要的一部分是从句。
从句有分为三种：状语从句定语从句名词性从句（主语从句、表语从句、宾语从句、同位语从句）。
“关于这些的介绍可以到摆渡知道中找，多的是。
”在由that引导的从句中，可以省略的有：定语从句中作宾语时、宾语从句中。
其它的不可以省略，如：定语从句中作主语、同位语从句等。
bu:三、只用that引导和不用that引导的场合1．只用that引导和不用that引导的场合1）当先行词既包括人又包括物时：He talked about the men and the books that attractedhim.2）指物的先行词被any, every, only, very, all, no等修饰时：These are the very points that interest me./That´s the only watch that I like most.3）指物的先行词被序数词或形容词最高级修饰时：The first step that we are to take is very difficult./This is the second card that he gave me.4）先行词是指物的不定代词all,little,few,much,及everything,anything,nothing等时：There is still much that can be done about it./Have you got everything that you need?5）先行词是who时：Who that have seen him does not like him?2．不用that的场合如下：1）非限制性定语从句中Last night ,I saw a very good film,which wasabout the LongMarch .2）介词放在关系代词之前时 This is the man from whom I learnt the news 3）句中出现了that，或先行词是that时I have found that which I was looking for.。
关系副词that及其省略
关系副词that及其省略在高中英语阶段，我们熟知的引导定语从句的关系副词有when、where和why三个。
而在英语的实际使用中，还有一个使用频率极高的关系副词，它就是几乎无处不在的that，但它又往往无影无踪，因为关系副词that经常在非正式语体中被省略。
1.关系副词that的真实性首先我们通过引用词典和语法书上的相关资料证明关系副词that 存在的真实性。
薄冰《实用英语语法详解》，p344：在口语和非正式场合，when、where和why或相当于关系副词的“介词+关系代词”结构可用that来代替并可省略。
张道真《英语语法大全》，p305：That……在非正式语言中可用作关系副词……徐广联《大学英语语法》，p790：That有时也可以代替关系副词when、where……《英汉大词典》，p2101：用作关系副词，引导定语从句，相当于when、where、why或in which等《英汉多功能词典》，p2206：用作关系副词……（场所、时间、理由、方法）（常省略that）上海交通大学《现代英语语法大全》，p1569：that作关系副词引导的限定性定语从句——当先行词是表时间、地点、距离、方向、方式等意义的词语时……常用that引导定语从句。
2.关系副词that的功能根据上面的资料，我们不仅能够确定that作为关系副词存在的真实性，也能看出that作为关系副词所具备的功能，即代替when、where、why三大关系副词或介词+which。
但这种代替是有条件的，主要适用于表示时间、地点、原因、方式这四大基本含义的先行词，即time（替代when）、place（替代where）、reason（替代why）、way（替代in which），其中time类的词汇最多，包括若干下义词，如hour、evening、summer、year、moment等。
笔者猜测这大概是因为这些词最基本、最常用，所以在约定俗成的惯性下挣脱了原有关系副词的束缚。
定语从句that省略
定语从句that省略定语从句that省略定语从句that省略问题，下面这种情况下定语从句中的that不可以省略1. think it + adj + that在讲今天的语法之前，我们回顾一下平时们在写作以及阅读中可能比较疑惑的例句：I think it important that you tell your mother the truth.疑惑之处在于，it后面为没有is?例句采用了这样的句型：“think it + adj”。
此处，it为形式宾语，that引导的宾语从句才是真实宾语，而important是宾语补足语。
所以，it是形式宾语而不是主语，不需要加be动词。
一般情况下，各位更熟悉的句型是：“I think (that) it is important that... ”;这两者都是正确的，注意区分和辨别。
感兴趣的同学还可以去这个网站看看：English Language & Usage。
它给出了以下几个类似的例句：e.g. We do not think it necessary to go.e.g. Some people do not think it important to be thrifty.2. 定语从句中的that定语从句中比较容易处理方面是，定语从句中“that”多可省略，表现为关系代词作宾语的情况：e.g. He must be the man (that) you have been looking for.此处，man作looking for的宾语。
至于不可省略的that，这里店铺只举两例，算是比较常用的规则哦：(1)紧接着上面阐述，除了关系代词作宾语的情况外，其余时候多不能省略that。
比如店铺给各位找来一个作主语的例子，各位可以举一反三：e.g. All that glitters is not gold.(发光的未必都是金子。
)此处，that指代主语，不可以省略。
定语从句的that可以省略吗
定语从句的that可以省略吗
1、关系代词that在定语从句中作宾语时可以省略；
2、当that在从句中作补语时可以省略；
3、在there be结构中出现定语从句，或在定语从句中出现there be时，用作主语的关系代词也可省略；
4、当先行词是reason，way，time做状语时可以省略。
定语从句
定语从句（也称关系从句、形容词性从句），一个句子跟在一个名词或代词（先行词）后进行修饰限定（对词句进行补充、修饰、限定，进而使原句内容更完整），就叫做定语从句。
按语法句式，定语从句在整个句子中做定语的成分。
被修饰的词叫先行词。
定语从句不同于单词作定语的情况，它通常只能放在被修饰的词（即先行词）之后。
定语从句由关系词（关系代词、关系副词）引导，关系代词、关系副词位于定语从句句首。
英语中引导宾语从句的连词that省略的问题
英语中引导宾语从句的连词that省略的问题
引导宾语从句的连词that 通常可以省略：
She said (that) she would come to the meeting. 她说过要来开会的。
I promise you (that) I will be there. 我答应你我会去。
I hoped (that) I would / should succeed. 我曾希望我会成功。
He thinks (that) they will give him a visa. 他想他们会给他签证。
He thought (that) they would give him 3 visa. 他本想他们会给他签证。
I expect (that) the plane will he diverted. 我料想飞机会改变航线。
I expected (that) the plane would be diverted. 我本料想飞机会改变航线。
Everybody knows (that) money doesn't grow on trees. 众所周知，金钱是不会从树上长出来的。
I suggested (that) they should / shouldn't drive along the coast. 我建议他们沿着/ 不要沿着海岸开车。
【注】有时为了强调，that引导的宾语从句可位于句首，此时that 不可省略：
That she is a good girl I know. 她是一个好姑娘，我是知道的。
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英语三大从句中that省略情况小结
在英语长句阅读中，我们常常会遇到连接词that省略的情况。
而一旦省略，对同学们的从句识别和判定会带来一定的困难，从而影响阅读的理解和翻译。
本文我们就来看一下，三种从句中连接词that省略用法的几种情况。
一、that引导定语从句,在从句中充当成分。
1. that在定语从句中作宾语时，往往可省略。
如：
（1）John once talked to his mom about the cities （that）he had visited abroad.
在从句中that作visit的宾语，故可以省略。
（2）The homework （that ）I finished last night was left at home.
在从句中that作finish的宾语，故可以省略。
2. that在定语从句中作主语时，不可省略。
如：
（1）The teacher that is kind to us goes back home very late every day.
在从句中that作主语，故不可以省略。
（2）My old school that was located in the suburban was razed to the ground.
在从句中that作主语，故不可以省略。
3.that在引导限定性定语从句时，有时相当于in which, at which, for which或on which, 并且在从句中可以省略。
如：
（1）Attitudes towards daydreaming are changing in much the same way (that ) (in which) attitudes towards night dreaming have changed.
（2）I like the music for the very reason (that ) (for which) he dislike it.
（3）We arrived the day (that ) (on which) they left.
二、that引导名词性从句时，充当连词，本身无实际意义。
1. that在引导宾语从句时，通常可省略。
如：
We know (that) sound can travel through air.
that引导的从句在主句中充当know的宾语，故为宾语从句，此时that可以省略。
但：（1）在介词短语后的宾语从句中that常不可省略，且前面往往有个形式宾语it。
如:
You may depend on it that they will support your plan.
See to it that you arrive at the railway station on time.
(2)两个宾语从句连用时，即使省略了第一个that，也不可省略第二个that。
如：
I believe (that) you’ve done your best and that things will get better.
(3)在双宾语结构中，that从句充当直接宾语或是间接宾语时，不可以省略that。
如：
He has told me that he will go to Shanghai tomorrow.
2. that引导主语从句、同位语从句及表语从句时，正规语中，通常不可省略。
（1）We heard the news that our team had won.
that引导同位语从句，that不可以省略。
（2）The fact is that we have lost the game.
that引导表语从句，that不可以省略。
（3）That you didn’t go to the party was a pity.
that引导主语从句，that不可以省略。
不过，如果it作形式主语，that从句放在句末，可以省略that。
如：
（4）It was a pity (that) you didn’t go to the party.
三、that引导状语从句时，充当连词，有时也可省略。
1.在结果状语从句中，that有时可以省略。
如：
The sound is so weak (that) you can’t hear it.
总之，that的省略现象在英语学习中很普遍，尤其是在定语从句和宾语从句中，大家遇到这两种句型时要多加留心that是如何使用的，注意总结。
另外，如果大家对that 省略的情况把握不好，建议大家在写作时最好不要省略that。