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In the book, Hawking explains both what it means to be a scientists and how science works. 作主语 :1. To do such things is foolish.2. 在 10 分钟里完成作业是很难的To finish the homework in ten minutes is very hard.It is foolish to do such things.It is very hard to finish the homework in ten minutes.作表语用作表语的不定式一般表示主语的内容． My wish is to become a teacher. Our plan is to improve English this year.不定式常用在系动词 be, seem, appear, get, remain 等后作表语．To become a teacher is my wish. 作宾语1. I didn’t expect to survive that long.2. Since then, hawking has continued to seek answers to questions about the nature of the universe.3. People who listen to Hawking’s lectures sometimes find it difficult to understand him.it动词 + 疑问词 + 不定式1. I don’t know what to do next.2. We haven’t decide where to spend our holiday.3. Marx gave some advice on how to learn a foreign language.这类词有 :tell, teach, show, advise, know, decide.One day, your doctor tells you that you may not have more than twelve months to live.做定语 ( 常常表示将来的动作 )不定式做定语时常放在被修饰的名词或代词之后1. 没有可吃的东西了There is nothing to eat.There is nothing that we can eat.2. 他只有一间老房子可住。He has only an old hose to live in.inHe has only an old hose that he can live in. 作状语（表示动作的目的，结果，原因等）1. He travelled around the world to give lectures.2. Readers were pleased and surprised to find that a scientists could write about his work in a way …3. To explain what they have seen,they build a theory about the way and…作宾补 I didn’t ask you to pay for the meal. They warned us to be careful of thieves.如下动词常跟这种复合宾语： want, wish, ask, tell, order,permit, advise, per...