初中英语语法(动词不定式)讲解_初中英语语法

初中英语语法(动词不定式)讲解

3)不定式做表语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)：

1.To see is to believe.2.To work means to earn a living.

另一种情况为主语是以aim，duty，hope， idea，job， plan，problem， purpose，thing，wish等名词为中心的短语，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;例如： 1.His aim is to study abroad in the near future. 2.The most important thing is to negotiate with them about the price. 3.What I want to say is to forget all the unhappy experience.

4)不定式作定语不定式结构作名词词组修饰语主要有三种类型：

第一种，被修饰的名词词组是不定式的逻辑宾语。例如： 1.There was really nothing to fear. 2.He gave me an interesting book to read. 如果不定式是不及物动词，后面就得加相应的介词。例如： 1.Mary needs a friend to play with. 2.That girl has nothing to worry about. 3.They have a strict teacher to listen to. 4.Although the film had been on for ten minutes， I still was not able to find a chair to sit on.第二种，被修饰的名词词组是不定式的逻辑主语;例如： 1.Have you got a key to unlock the door? 2.The action to be taken is correct. 3.There is nothing to be gained by pretending.第三种，被修饰的名词词组是不定式的同位结构。这类名词通常是表示企图、努力、倾向、目的、愿望、is算、能力、意向等意义的名词：ability， attempt， effort， impulse， inclination，wish等。例如： 1.Her daughter will make an even bigger effort to please her. 2.I have no wishto quarrel withyou. 3.Neither of them had any inclination to do business with Mary.