1、一種情況為主語是不定式(表示條件)，表語也是不定式(表示結果)

　　To see is to believe/To work means to earn a living.

　　2、另一種情況主語是以aim,duty,hope,idea,happiness,job,plan,problem,purpose,thing,wish等為中心的名詞,或以what引導的名詞性從句，不定式表語對主語起補充說明作用

　　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、因為不定式所修飾的名詞是不定式的賓語，所以如果不定式動詞是不及物動詞，那么就要在動詞后加上相應的介詞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、一些表示企圖、努力、傾向、目的、愿望、打算、能力、意向等意義的名詞后面要求接不定式作其定語，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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