Jack needs ______ and needn’t ______ too much.[ ]A. exercise more , to sleepB. to exercise more , sleepC. more exercise , to sleep D. have more exercise, s-七年级英语

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进行式 (not) to be doing   完成进行式 (not) to have been doing  

  • 不定式的用法:
    1、不定式作主语
    例如:To remember this is very important.
    注意:为了避免头重脚轻,在许多情况下,通常都将作主语的不定式置于句子后部,而在句首主语位置使用形式主语it。
    例如:It is very important to remember this.
    2、不定式作表语
    例如:He seems to be ill.
    注意:不定式作表语主要有三种情况,一是用于seem, appear, prove等系动词之后的不 定式(尤其是to be),
    二是像My job is to sweep the floor. 这样的主语与表语“等价”的情形,
    三是表示想法、约定、义务、命令、可能性、命运等,如: 
    You are to come when I call.
    3、不定式作宾语
    例如:I can not afford to buy a car.
    注意:
    ①不定式不仅用作动词的宾语,还可用作个别介词(but, except)的宾语。
    例如:I had no choice but to wait.
    ②当作宾语的不定式后跟有宾语补足语时,通常要用形式宾语it代替不定式,并将真正的宾语不定式置于宾语补足语之后
    例如:I find it difficult to learn Japanese well.
    4、不定式作宾语补足语
    例如:Who taught you to drive?
    5、不定式作定语
    例如:I have a question to ask you.
    注意:有的名词(如way, chance, right等)后用作不定式可换成of doing sth.
    如:It is the best way to do (of doing) it.
    但是以下名词后接不定式作定语时通常不能换成of doing sth.
    attempt  courage  decision  effort  fortune  failure  invitation  wish
    6、不定式作状语
    例如:I went to France to learn French.

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