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Meaning of “not” - Learner’s Dictionary

not

adverb     /nɒt/
A1 used to form a negative phrase after verbs like 'be', 'can', 'have', 'will', 'must', etc, usually used in the short form 'n't' in speech: I won't tell her. I can't go. He hasn't eaten yet. Don't you like her? It isn't difficult (= It is easy). The service isn't very good (= it is bad). You're coming, aren't you? I will not tolerate laziness.Yes, no and not
A1 used to give the next word or group of words a negative meaning: I told you not to do that. I like most vegetables but not cabbage. "Come and play football, Dad." "Not now, Jamie." "Whose are these?" "Not mine."Yes, no and not
A2 used after verbs like 'be afraid', 'hope', 'suspect', etc in short, negative replies: "Do you think it's going to rain?" "I hope not." "Have you finished?" "I'm afraid not."Yes, no and not
certainly/hopefully not
used after an adverb in short, negative replies: "She's not exactly poor, is she?" "Certainly not." "We won't need much money, will we?" "Hopefully not."Yes, no and not
not at all
B2 used instead of 'no' or 'not' to emphasize what you are saying: "I hope this won't cause you any trouble." "No, not at all." I'm not at all happy about it.Intensifying expressionsYes, no and not
Not at all.
B1 used as a polite reply after someone has thanked you: "Thanks for all your help." "Not at all."Polite expressions
if not
A2 used to say what the situation will be if something does not happen: I hope to see you there but, if not, I'll call you.Yes, no and not
or not
A2 used to express the possibility that something might not happen: Are you coming or not?Yes, no and not
not a/one
used to emphasize that there is nothing of what you are talking about: Not one person came to hear him talk. "You haven't heard from Nick, have you?" "Not a word."Yes, no and not
(Definition of not from the Cambridge Learner’s Dictionary © Cambridge University Press)
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Avoiding common errors with the word enough.
Avoiding common errors with the word enough.
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by Liz Walter Enough is a very common word, but it is easy to make mistakes with it. You need to be careful about its position in a sentence, and the prepositions or verb patterns that come after it. I’ll start with the position of enough in the sentence. When we use it with a noun,

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