Come early, but not before six.
It’s working, but not properly.
I believe he will succeed, though not without some difficulty.
not用在I hope; I believe; I’m afraid; I guess; I suppose; I expect之后,构成省略句。
—Will it snow today ?
—I hope not.
5. 用no构成否定句:no+名词(单,复数,不可数)相当于not+ a +名词/ not + any +名词
No machine would work for long if it were not properly lubricated.
The nations of Europe and America have found that no country can produce all its needs without trading.
Take that towel, I have no other.
I can walk no farther.
There is no knowing what will happen.
6. 某些否定副词或代词:seldom; never; hardly; rarely; little; few; none; nowhere; neither等在句中构成否定句:
I can seldom find time for reading.
Mirror tells only the facts, never the poetry.
The rumor came from nowhere.
None but fools have ever believed it.
7. 否定转移:当think; believe; suppose; imagine等动词引导否定意义的宾语从句时,把从句中的not提到主句这些动词前面,是主句变成否定句:
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