宾语补足语.

The words immediately set us all laughing.

Once we caught him dozing off in class.

His remark left me wondering what he was driving at.

在see, hear, feel, watch, notice等动词后, 及可用现在分词, 也可用不定式构成宾语补足语. 用现在分词时, 表示动作正在发生, 用不定式时表示动作发生了.

Do you hear someone knocking at the door?

Yes, I did. I heard him knock three times.

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