1 used in negative sentences and questions to talk about something that has not happened but that you expect to happen:
(British English) I haven’t received a letter from him yet; (North American English) I didn’t receive a letter from him yet; ‘Are you ready?’ ‘No, not yet.’; We have yet to decide what action to take (= We have not decided what action to take).
BRITISH/AMERICAN already • 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; Did you eat yet? • 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; Have you eaten yet? • Just is mostly used with the perfect tenses in British English and with the simple past in North American English: I’ve just had some bad news. (British English); I just got some bad news. (North American English)