Haven't refers to the past up until now. So if you haven't done something, you haven't done it for a specific period of time (day, month, ever, etc.) Didn't refers to a specific point of time that has already passed. For example, if it is 7 PM, you could say "I didn't eat dinner at 6" or "I haven't eaten dinner yet today". In both instances ...

2012年5月18日 · For example, I haven't is more common than I've not. You may prefer the former to avoid standing out. Grammatical context: You may wish to choose a contraction based on the grammatical context in which it appears. For example, contracting I have not into I haven't is correct when the have is non-auxiliary in function (e.g. "I haven't a clue").

Haven't, on the other hand, sounds a bit ambiguous (unclear). It indicates the present perfect tense, which doesn't make much sense when it follows the past tense indicating by got . It also breaks the construction made by the followed sentence.

In the last two weeks I haven't had much time, so I haven't got that quotation for you. In the last two weeks I haven't had much time, but I expect to be able to address your question soon. In colloquial use, however, particularly when the fairly recent past is concerned, you are likely to hear either form regardless of context.

When I speaking English I think in my mind that's easier to pronounce the word NOT separately from the verb to be like are or is for example instead of I say you aren't most if the times I'd say you're not or it's not so to me it's preferable use I've not it's clearer I don't know why but I think I'm not saying the negative form when I use these contractions isn't, aren't or haven't

In context, haven't is the grammatically correct sentence. Hadn't would not make sense as the order of events ought to be preserved. Nevertheless, hadn't would make sense if something happened between the two events and the point at which they had yet to leave were mentioned by the other individual(s) in the conversation.

2018年10月4日 · Do I say His classmates hasn’t been interviewed?” Or haven’t or hadn’t? It is pretty confusing to me, especially the past perfect, present participle

Both verbs work: haven't works because it's referencing the time before you heard the current song, and hadn't works because it's referencing the last time you heard a song as good as this one. If you didn't hear the song you're talking about recently, you need to say that good, and the only verb that works in this case is hadn't.

2018年10月30日 · The only difference between have not and its contraction haven't is formality; contractions like haven't are considered less formal. But the meaning and usage are the same. But the meaning and usage are the same.

"They haven't started yet" is the negative of the perfect tense, "They have started." As the article puts it, it is "used for describing a past action's effect on the present." It more or less requires that the idea gets extended in time, which "yet" does nicely.