I have something to do.这个意思是我有事要做;这是做宾语补足语
不定式是指to 加 动词,一般表示将来,目的,针对等含义。不定式本身不能直接作为从句,不定式要有主语等才能作为句子放到从句中。
动词不定式短语代替宾语从句时,经常和疑问词连用.
1.I didn't know what I could do. =I didn't know what to do.
2.She hasn't decided where she will go.=She hasn't decided where to go.
3.They want to know when they will leave.=They want to know when to leave.
4.He doesn't know how he can get to the park.=He doesn't know how to get to the park.
5.Jim didn't decide which coat he should buy.=Jim didn't decide which coat to buy.
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