He got up early to catch the first bus.
He worked hard to catch up with the other students.
(7) 作独立成分
To tell you the truth, I told a lie.
(8)疑问词+不定式结构。 如:
I don't know how to choose them.
I cannot decide where to go.
(9) 不定式的否定式。如:
I decided not to go.
(10) 不定式的完成式。如:
He seemed to have cleaned the room before I came in.
The boy is said to have been sent to the hospital last week.
(11) too to 结构。如:
He was too excited to go to sleep.
He was only too glad to go. (他太高兴了,乐意去。)
(12) 主动表被动。如:
The book is easy to read.
I have a book to read.
II. 例题
例1. I haven't got a chair ____.
A. to sit B. for to sit on C. to sit on D. for sitting
解析:该题选C。不定式 to sit on 在句中作定语,修饰名词 chair. 因为不定式和它所修饰的名词间是动宾关系,所以不定式必须是及物动词,故此处 on 不能省略。
例2. He was made ____. A. go B. gone C. going D. to go
解析:该题选D。make sb. do sth. 如果是被动形式,不定式 do 前的 to 不能省略。
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