什么是it
知识点：《什么是it》 收集：戚友焊 编辑：栀子花女孩
本知识点包括：1、IT是做什么的啊？ 2、it是什么职业 3、IT产品是什么 4、IT男是什么意思，包括IT 5、IT是什么意思？？？？？ 。
你好!it的句型很多的.
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 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. 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.
It is very clear that he’s round and tall like a tree.
= That he’s round and tall like a tree is very clear.
4. It is important ( necessary, right, strange, natural...) that ...
该句型和上一个同属一个句型.由于主句中的形容词不同,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 necessary that he (should) remember these words.
5. It is said (reported, learned.) that ...
该句型中的it 仍是形式主语,真正主语是that 引导的主语从句.该结构常译为”据说（据报道,据悉．．．）”.
It is said that he has come to Beijing.
It is reported that another earth satellite has been put into orbit.
6. It is suggested ( ordered ... ) that ...
该句型和上一个同属一个句型.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.
It was ordered that we ( should ) arrive there in two hours.
7. It is a pity ( a shame ... ) that ...
该句型中,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.
It is a pity that such a thing ( should ) happen in your class.
这种事竟然发生在你们班上,真是遗憾!
It is a pity that he is ill. 他生病了,真遗憾!
8. 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① 常用过去时态表示虚拟．② 有时也用should + 动词原形,should 不能省.常译为”是（正是）．．．的时侯．．．”.
It is time that children should go to bed.
= It is time that children went to bed.
9. It is the first ( second ... ) time that ...
该句型要和上一个句型区别开来.该句型中的 that 从句不用虚拟语气,而用完成时态.至于用什么完成时态,由主句的谓语动词的时态决定.如果是一般现在时,后面从句用现在完成时态；如果是一般过去时,后面从句则用过去完成时态.该结构中 that 可以省去；it有时用 this 替换．常译为”是一（二）．．．次．．．”.
It is the first time I have been here.
= This is the first time I have been here.
10. It is . since ...
该句型主要用作处理瞬间动词的完成时,又要和表示一段时间的时间状语连用的问题.主句中是时间作表语,其时态是现在时或完成时,since 引导的从句通常是一般过去时态,而且是瞬间动词.如果主句是一般过去时,从句则用过去完成时.
It is ( has been ) 5 years since his father died.
11. It is ... when ...
该句型中的 when 引导的是一个时间状语从句,主句中的 it 指时间,表语由具体的时间充当.常译为”当．．．的时候,是．．．”.
It was 5 o’clock when he came here.
12. It be ... before ...
该句型主句中的 it 指时间, 主句中的时态常是将来一般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.常译为”．．．之后．．．”.
It was 3 days before he went to Beijing.
It will be not long before he finishes his job.
13. 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．．．
14. It takes sb. ... to do sth.
该句型中的不定式是真正的主语,it是形式主语,句型中的直接宾语是时间.常译为”做．．．要花费某人．．．”.
It took thousands of people many years to build the Great Wall.
15. 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 ).
It is no good learning English without speaking English.
16. It doesn’t matter whether ( if ) ...
该句型中whether(if) 引导的从句是真正主语,该句型常译为 ”不论（是否）．．．没关系．．．.
It doesn’t matter if they are old.
17. It is kind ( of sb. ) to do sth.
该句型中的不定式短语是真正主语,如果不定式的逻辑主语是由 of引起,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 , good （好心的）, honest , horrible , kind , lazy , modest , naughty , nice（有教养的）, polite, rude , silly , stupid , wise , wrong（错误的）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.
18. It is necessary ( for sb. ) to do sth.
该句型与上一个同属一个句型.如果不定式的逻辑主语是由for引起,主句中的形容词通常是表示重要性,紧迫性,频繁程度,难易,安全等情况的形容词.常见的形容词有：① important, necessary, natural ② easy , safe , common , normal , hard , difficult , dangerous , unusual, rare , impossible , pleasant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
19. It looks ( seems ) as if ...
该句型中it无意义. as if 引导一个状语从句.常译为,”看起来好象．．．”如果与事实不相符合,则用虚拟语气．
It looks as if he is ill.（真的病了）
It looks as if he were ill. （没有生病）
It seemed as if he were dying.
20. 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.
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.
it is a long story说来话长；一言难尽
It is a pity that 遗憾的是
it is asserted that有人断言；有人主张
it is assumed that假定；人们认为；据推测
it is certain that毫无疑问……；肯定……
It is considered that据知
it is important这非常重要 it is important for sb to do：对某人来说做某事重要
It is important that ...：重要的是
It is learned that据悉…；众所周知
It is no use doing：做.是没用的
it is obvious that显然…
It is raining下雨了
it is reported that据报道
It is said that：据说；有人说,；据说……
It is suggested that ...：建议,有人建议
It is supposed that...：据推测,人们猜测
it is the same with亦复如是
it is time to do sth.：是时候做什么事情了；是该做某事的时候了
it is time for sb to do：该是做某事的时候了
主+谓
主+系动词+表
主+谓+宾
主+谓+宾+宾补
主+谓+间宾+直宾
所有的英语句子都是根据英语五种基本句型【基本句型一：SV（主＋谓）
基本句型二：SVP（主＋谓＋表）
基本句型三：SVO（主＋谓＋宾）
基本句型四：SVoO（主＋谓＋间宾＋直宾）
基本句型五：SVOC（主＋谓＋宾＋宾补） 】
句子的主干:It's as if they were cosmic beings.
这是一个主系表句型:It(主语)+ is(系动词)+(表语从句)as if they were in some sense cosmic beings in violent and lovely contrast with us suburban creatures.
在表语从句中,as if是引导表语从句的连词;
they were cosmic beings是表从的主干,也是一个主系表结构;
in some sense是状语;
in violent and lovely contrast with us suburban creatures是介短作定语,修饰cosmic beings;
其中,in contrast with是一个固定短语,violent and lovely是作定语,修饰contrast; 句末的suburban creatures是us的同位语.
句意:从某种意义上讲,他们似乎是宇宙人,同我们这些凡夫俗子形成了强烈而鲜明的对照.
1.interesting to see,called
2.to keep exercising
3.It's wrong to look down on
4.It's helpful to drink more water
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