A 动词不定式各种形式的举例
不定式的现在式: to work, to do
不定式的现在进行式: to be working
to be doing
不定式的完成式: to have worked,
to have done
定式的完成进行式: to have been working
to have been doing
不定式的现在式的被动形式: to be done
不定式的完成式的被动形式: to have been done
B 不定式的整个形式包括两个字:to+动词,如上所示;但在一些特定的动词和表达方法之后用不带to的不定式形式(参见第246节):
You had better say nothing.
你最好什么也不说。
C 一般不宜在to与动词之间置入别的字;但有时有人这样用,
D 为了避免重复,有时不定式的to可代替整个不定式:
Do you smoke?
No,but I used to(smoke).
你吸烟吗?
不,但我以前吸烟。
无题
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