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1、It is +adj. +动词不定式的用法 -I. It is + adj. + to do something结构句中it是形式主语，真正主语是动词不定式to do something。因此也可以表达为to do something + is +adj.。e.g. It is amazing to drive past fields which seem to go on forever or whole hills covered with neat rows of grapevines。本句形式主语为it。真正主语to drivegrapevines移到了句子后部，使句子变得平稳，不致主
2、语太长。如果把真正主语放在前面，那么整个句子就显得头重脚轻。因此，就用it作为先行主语。这种结构还有两种动词不定复合结构。1. It is + adj. + for somebody to do somethinge.g. It was very difficult for them to fly because men have not got wings. 此句真正的主语是动词不定复合结构for them to fly。其中them是to fly的逻辑主语。2. It is + adj. + of somebody to do somethinge.g. It is sensible_ y
3、ou to bring an umbrella in such weather.A. in B. for C. with D. of答案为D。这里sensible跟逻辑主语you的关系是表达人的特点、性格、本质等。像此类形容词还有kind, foolish, clever, wise, friendly等。II. It is +名词+ to do something结构e.g. It is great fun to see the pandas walking in the zoo.III.另外, it作先行主语时还有其他用法1. it +及物动词+宾语+不定式e.g. It cost me
4、100 dollars to repair the car.It takes me two hours to finish my homework every day.It gave me great pleasure to watch them.2. it + be +名词/形容词+ doinge.g. It is no use studying for an exam at the last minute .It is a waste of time talking to him.It is pleasant sitting here.ExerciseI. Choice1. Today i
5、t is easy_ on-line and millions of people use the Internet everyday.A. get B. to get C. gets D. got2. It is clever_ you to answer such a question.A. for B. on C. with D. of3. _ fun it is to ride on a camel in the desert!A. What B. What a C. How D. How a4. It takes 3 days for the parcel _ America by
6、air mail from Shanghai .A. reach B. reached C. to reach D. reaches5. _ important thing it is to do eye exercises everyday!A. What B. What a C. What an D. How6. It is no use _ about the school lunch.A. complain B. complaining C. to complain D. complained II.用it作形式主语改写句子1. To speak English more is ver
7、y important for you.2. To do more exercises is very helpful.3. To do is more important than to say.4. To help others is our duty.5. To go to the South Pole is the boys wish.6. To drink plenty of water is good. Key: I.1.B 2.D 3.A 4.C 5.C 6.B 2 . : . 句改式作用 . _ . _. . _ . . . _ . _ . . . _ . +容词 + 定+宾动+ 用其还行 ,另 结结 + 等等 , , 有容此等、的达关 语辑 里。 . . _ + 语辑的 其。 结复动语的句. .构构复种还种语行先用，因重就个那前语真如长语稳得句部句移 主 为主 . + 为表可 不是真语式中结 . -法用定+ +