知识点：不定式作表语
1、一种情况为主语是不定式(表示条件)，表语也是不定式(表示结果)
To see is to believe/To work means to earn a living.
2、另一种情况主语是以aim,duty,hope,idea,happiness,job,plan,problem,purpose,thing,wish等为中心的名词,或以what引导的名词性从句，不定式表语对主语起补充说明作用
His wish is to buy a luxurious car in the near future./The boss's plan is to start building the skycraper immediately./What I want to say is to get rid of the plan forever.
1)The most important[A]thing is negociate[B]with them about[C]the future of[D]the plant.
3、因为不定式所修饰的名词是不定式的宾语，所以如果不定式动词是不及物动词，那么就要在动词后加上相应的介词He has a lot of trifles to deal with./I had got no place to live in./That girl has nothing to worry about./the subject to concentrate on./He has a strict teacher to listen to./She has four children to look after./She had a sick mother to live with./This is the very person to sell your ticket to.
1)Although the lecture had already been on for five minutes,I still was not able to find a chair.
[A]to sit[B]for to sit on[C]to sit on[D]for sitting
4、一些表示企图、努力、倾向、目的、愿望、打算、能力、意向等意义的名词后面要求接不定式作其定语，如：ability,attempt,effort等
1)During[A]the 19th century scientists found[B]that when certain parts of the brain were damaged[C]men lost the ability doing[D]certain things.
2)What is new,however,is the scientific attempt whether other planets beyond our own have given birth to advanced civilizations.
[A]discover[B]discovers[C]discovering[D]to discover
3)Surely her daughter would make an even bigger effort her?
[A]please[B]pleased[C]to please[D]having pleased
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