(否定后面的词或短语，或作否定的回答)不;(构成动词be、do和have及情态动词can或must等的否定形式，常缩略为n't)没有;否，或许不;（拒绝或不允许）adv.
not a…
not one…
（用于强调）一个也不，一件也没
used for emphasis to mean ‘no thing or person’
He didn't speak to me─not one word.
他没跟我说话——一个字也没说。
not at all
（礼貌地答谢或同意）别客气，没关系，没什么
used to politely accept thanks or to agree to sth
‘Thanks a lot.’ ‘Not at all.’
“非常感谢。”“不客气。”
‘Will it bother you if I smoke?’ ‘Not at all.’
“我抽烟你介意吗？”“没关系。”
not only… (but) also…
不仅…而且…
used to emphasize that sth else is also true
She not only wrote the text but also selected the illustrations.
她不仅写了正文部分，而且还挑选了插图。
not that
倒不是；并不是说
used to state that you are not suggesting sth
She hasn't written─not that she said she would.
她还没写信来——倒不是她说过她要写。
