It is a good act to help the others.
2).it 替代真正的主语——动名词短语,以动名词短语做主语的句子，主要在以no good, no use, no harm, dangerous, foolish 等词作表语的句中. It?s no harm drinking running water in that area。 It?s foolish talking like that.
3).it 替代从句作主语，用从句做主语的带it 的句子很多,常见的有下面几类： ① It is a pity (a shame ,a fact ,a wonder ,a good thing,etc. )that… It is a shame that he didn?t pass the exam.
② It is strange ( surprising,obvious ,true, good,possible,clear,etc. ) that… 。 It was clear that they had no desire for peace. ③ It seems (happened ,turned out,etc.)that…
It seemed that things were not as they expected. ④ It is said ( decided ,expected ,etc)that … It is said that the tickets have been sold out . 4.用作形式宾语。
当复合宾语中的宾语是不定式,－ing短语或从句往往用it作形式宾语,而将真正的宾语移至句末,句子重心后移。
1) We find it difficult to learn English well in such a short time． 2) We think it no use crying over spilt milk．
3) We made it clear when and where we were going to have the meeting．
常用句型及考点
I. 形式主语型
1. It is clear (obvious，true，possible，certain…) that…
2. It is important (necessary，right，strange，natural…)that…
掌握本句型，应该记住所列举的形容词，并且记住that后的从句应用虚拟语气 (should+动词原形)，should可以省去。 3. It is no good (use) doing sth． 4. It is a pity (a shame …) that…
本句型中，that后的从句一般用虚拟语气 (should十动词原形)，should可以省去。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。 5. It is time (about time，high time) that… 本句型中that后的从句应该用虚拟语气。 6. It is the first (second…)time that… 7. It is said (reported，learned…．)that… 8. It is suggested (ordered…) that…
本句型中的过去分词应该是表示请求、建议、命令等的词，that后的从句要用虚拟语气(should十动词原形)，should可以省略。常译为“据建议；有命令……”。 9. It happens (seems，appears) that… 10. It takes sb…to do sth． 11. It doesn?t matter whether… 12. It is kind (of sb) to do sth．
本句型中的不定式如果需要逻辑主语，则须要前置介词of，而句型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，honest，
horrible，kind，lazy，modest，naughty, polite，rude，silly, stupid，wise，wrong等。 13. It is necessary ( for sb) to do sth． 14. It is (just) like sb to do sth．
本句型为“某人(恰恰)是……样子”。用来表示赞扬或不满，若用否定式，则表示怀疑。 例：It's like him to leave the work to others． 他就是这样的一个人，把工作推给别人。 15. It is up to sb to do sth．
本句型表示“谊由某人做……”。
能力提高
1. ----Have you heard the latest news? ----No, what __?
A. is it B. is there C. are they D. are those 2. __felt funny watching myself on TV. A. One B. This C. It D. That
3. It was because of bad weather __the football match had to be put off. A. so B. so that C. why D. that
4. He didn’t make __clear when and where the meeting would be held. A. this B. that C. it D. these
5. In fact __is a hard job for the teacher to educate children. A. this B. that C. there D. it
6. The chairman thought __necessary to invite Professor Smith to speak at the meeting. A. that B. it C. this D. him
7. ----Steven has got the first prize in the math contest. ----__is no wonder that he looks so happy today. A. It B. As C. This D. That
8. I like __in the autumn when the weather is clear and bright. A. this B. that C. it D. one
9. It was not yet 8 o’clock __he arrived home. A. before B. when C. that D. until
10. __is a fact that English is being accepted as an international language. A. There B. This C. That D. It ACDCD BACBD
11. She got herself __a real state before the interview. A. out B. into C. in D. down
12. __various difficulties. Mr. Zhang kept on studying until he got the proper answer. A. In spite of B. In point of C. In view of D. On behalf of 13. __is five kilometers from the office to my home. A. It B. There C. That D. This
14. Few people have ever __deep into the forest, for it is extremely dangerous. A. risked to B. tried to go C. tried going D. risked going
15. The police began last week investigating rumors that the statue was taken from
__excavation in Sicily.
A. illiterate B. illogical C. illegible D. illegal
16. Right now I feel like __you the truth. A. to tell B. tell C. telling D. told 17. __four years since I left London.
A. It was B. There was C. There is D. It is
18. A good friend is one who will stand __you when you are in trouble. A. for B. by C. out D. up BAADD CDB
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