知识点：不定式的否定形式：否定形式是在不定式的标志to前边加not a
例:
1)that new information to anyone else but the sergeant.
[A]They asked him not to give
[B]They asked him to don't give
[C]They asked him no give
[D]They asked him to no give
2)Please remember lights on in the future.
[A]don't leave
[B]not to leave
[C]not leaving
[D]don't to leave
介词except和but(作“只有……，只能……”讲时)跟不定式结构(but与不带to的不定式连用)
He seldom goes back home except to ask for money from his parents.
He did nothing there except watch TV for the whole night.(不带to的不定式)
I had no choice but to stay in bed.
Last night I did nothing but prepare my lessons.
例:
1)Lots of empty bottles were found under the old man's bed.He must have done nothing but.
[A]drink
[B]to drink
[C]drinking
[D]drunk
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