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(6) 非谓语动词作补足语:
不定式和分词可以作宾语补足语和主语补足语。有些动词后只跟不定式作宾语补足语或主语补足语，如:ask， tell， order， want， wish， warn， allow， advise， permit， forbid等。
有些动词后既可以跟不定式又可以跟分词作补足语，但意义不同:
(1) 在see， hear， watch， feel， observe， listen to， notice等动词后，用现在分词表示动作正在发生(即处于发生的过程中)，用不定式表示动作发生了(即动作全过程)，注意主动句中不定式不带to，但在 被动结构中必须带to。如:
When she saw him coming， she turned around and walked quickly toward the corner.
The thief was seen to slip into the house just now.
(2) have sb. do表示主体使客体干什么事；have sb. \ sth. doing表示主体使客体处于某种状态； have sth. done表示动作是别人做的或与主体意志无关。如:
At first she wasn’t willing to have her daughter-in-law go out to work.
They had to have all the lights burning all day long because of poor light in the room.
We must have the machine repaired as soon as possible.
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