to do,doing,done,作宾语补足语时有何区别?
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ing与to do做宾补

现在分词通常在下列动词后作宾语补足语：see ,hear ,notice ,watch ,keep ,find ,get ,have ,feel

e.g.

·He heard someone knocking at the door .

·I”m sorry to have kept you waiting .

在see ,hear ,watch ,notice 等动词后不定式作宾语补足语与现在分词作宾语补足语的区别：

现在分词作宾语补足语表示动作正在进行；不定式作宾补表示动作从开始到结束的全过程.

e.g.·As I drove past the park ,I saw some people playing football .(= When I saw them ,they were in the middle of playing .)

·Last week ,I went to London and saw England play Brazil in the big football match .(= I saw the whole game .)

·I heard someone coming up the stairs .

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