曾经有朋友问我:I look forward to hear from you soon 对,还是I look forward to hearing from you soon 对。我说后者对,前者错。他说,为什么to后面的动词可以有-ing呢?
这问题很有意思,相信其他人也会这样问。
这问题就是今天的话题了。
大家知道,to是不定式动词(Infinitives)的标志,如:to come, to go, to eat, to sleep, to play, to work, to sing, to take等等。
不定式动词是英语三种无限定动词(Non-finite verbs)中的一种。它的主要功能包括协助组成动词句型。例如:
1. 主语+动词+不定式动词/短语
(1) Helen likes to sing.
(2) The man wants to see you.
2. 主语+动词+宾语+不定式动词/短语
(3) Jack advised me to come.
(4) She asked the boy to go out with his brother.
3. 主语+动词+宾语+不带to不定式动词/短语
(5) We all heard them laugh.
(6) They saw the leaves fall down.
(7) Did you notice the old man rush to the bus stop?
(5)-(7)里的langh, fall, rush都是不带to的不定式动词或短语。
此外,当不定式动词在助动词或情态动词后面时,也是不带to的。例如:
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