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used in negative sentences and questions to talk about something that has not happened but that you expect to happen （用于否定句和疑问句，谈论尚未发生但可能发生的事） - (British English)
I haven't received a letter from him yet. 我还没有收到他的信呢。 - (North American English)
I didn't receive a letter from him yet. 我还没有收到过他的信。 - not yet
‘Are you ready?’ ‘No, not yet.’ “你准备好了吗？” “还没有。” We don't yet know what really happened. 我们还不知道到底发生了什么。 - have yet to do something
We have yet to decide what action to take (= We have not decided what action to take). 我们尚未决定采取何种行动。
British/American already / just / yetalready / just / yet- Already and yet are usually used with the present perfect tense, but in North American English they can also be used with the simple past tense:
I already did it. 我已经完成了。 Did you eat yet? 你吃饭了吗？
- However, this is much more common in spoken than in written English and some Americans do not consider it acceptable, even in speech. The present perfect is more common in North American English and almost always used in British English:
I’ve already done it. 我已经完成了。 Have you eaten yet? 你吃饭了吗？
I already knew this because Mike had told me. 我已经知道了，因为迈克已经告诉我了。
- Just is mostly used with the perfect tenses in British English and with the simple past in North American English:
- (British English)
I’ve just had some bad news. 我刚刚得到一些坏消息。 - (North American English)
I just got some bad news. 我刚得到个坏消息。
- (British English)
- (British English)
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(used in negative sentences 用于否定句 now; as soon as this 现在；即刻；马上 -
used to emphasize an increase in number or amount or the number of times something happens （强调次数或数量的增加） - the best, longest, etc. something yet
used to emphasize that something is the best, longest, etc. thing of its kind made, produced, written, etc. until now/then 迄今为止，到当时为止（最好或最长等的） the most comprehensive study yet of his music 迄今为止对他的音乐最为全面的研究 It was the tallest building yet constructed anywhere. 这是迄今为止最高的建筑。
from now until the period of time mentioned has passed 从现在起直至某一时间；还 - could, might, may, etc. do something yet
used to say that something could, might, etc. happen in the future, even though it seems unlikely （表示将来可能发生，尽管现在似乎没有可能）早晚，总有一天 - yet worse, more importantly, etc.
used to emphasize an increase in the degree of something (= how bad, important, etc. it is) （强调程度的增加）更 a recent and yet more improbable theory 一个新近提出的但更加不切实际的理论
Word OriginOld English gīet(a), of unknown origin.
Idioms
as yet
better yet
used to say that while one thing is good, another thing is even better 更好： 虽然一件事情是好的，但另一件事情甚至更好You can see and, better yet, hear the effects of these changes on their website. 你可以在他们的网站上看到，更好的是，听到这些变化的影响。 I wanted to make my parents proud by becoming a lawyer or, better yet, a doctor. 我想成为一名律师，或者更好的是成为一名医生，让我的父母感到骄傲。
not just yet
not now but probably quite soon 这会儿还不；尚未但可能很快 I can't give you the money just yet. 我这会儿还不能给你钱。
so near and yet so far
used to comment on something that was almost successful but in fact failed 功败垂成；功亏一篑