部分否定（不完全否定/半否定）的几种方法
一、all的否定形式： not all……（all ……not）并非都……（不是所有的都）
Not all men can be masters. = all men cannot be masters.并非人人都能当头头。
二、both的否定形式：not……both或both……not 并非两个……都……
I don’t want both the books我并不是两本书都要。
Both (the) windows are not open.两扇窗并不是都开着。
三、every的否定形式：不是每……都
Not every book is educative. = Every book is not educative.不是每本书都有教育意义。
四、always的否定形式：并非总是（并非一直……）
He is not always so sad .他并非一直都这样悲伤。
五、entirely、altogether、completely、quite的否定形式：不完全……并非完全
The business man is never to be trusted entirely .不可以完全信任商人。
He felt not altogether satisfied.他不完全满意。
I don’t agree completely。我不完全同意。
What he did was not quiet proper.他做得不十分妥当。
六、all the time ……并非一直/未必老是
A foolish man doesn’t make a mistake all the time.笨人并不是老是犯错误
七、not……and的否定形式：往往是否定and后面的部分
He did not speak clearly and correctly。他讲得清楚但不正确
She can not sing and dance. 她会唱歌但不会跳舞。
and如果换成or，not对其后面的部分完全否定
He did not speak clearly or correctly.他讲得极不清楚又不正确。
如果上述的all、both、always以及entirely、altogether、completely、quite和all the time等词作完全否定，那就要分别用于之相对应的完全否定词，如no 、none、nether、no one 、never、not(never)……at all等。
All of them can do it. —— none of them an do it.
Both are good.—— nether is good.
Everybody likes it.—— nobody likes it.
He is always late.—— he is never late.
He was here all the time.—— he was never here
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