Eg. No one can tell me where to find John.
When to the exam is still unknown.
The problem is how to get enough money.
不定式的进行式、完成式和被动式
①不定式的进行式由to be + V-ing构成,用来表示谓语动词动作发生时,不定式的动作正在进行。
Eg. Some students pretended to be reading English when the teacher came in.
②不定式完成式由to have + V-ed构成,用来表示动作发生在谓语动作之前。
Eg. 2005年江苏卷No.25
--- Is Bob still performing?
--- Im afraid not. He is said _______ the stage already as he has become an official.
A. to have left B. to leave C. to have been D. to be left
答案是A
③不定式的被动式分为一般式被动to be V-ing和完成式被动to have been V-ed。当不定式的逻辑主语是不定式所表示的动作的承受者时,不定式要用被动语态。
Eg. It is an honour for me to be invited to the party.
The book is said to have been translated into many languages.
2005年辽宁卷No.22
All these gifts must be mailed immediately _____ in time for Christmas.
A. in order to have received B. in order to receive C. so as to be received D. so as to be receiving Grammar: 动词不定式
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