Already and yet are usually used with the present perfect tense, but in NAmE they can also be used with the simple past tense. * already 和 yet 通常与现在完成时连用，但在美式英语中还可与简单过去时连用：◆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 NAmE and almost always used in BrE.不过，此用法多见于口语，而且有些美国人认为，即使在口语中此用法也不可取。在美式英语中较常用现在完成时，在英式英语中则几乎总是用现在完成时表示：◆I've already done it.我已经完成了。◆Have you eaten yet?你吃饭了吗？
Just is mostly used with the perfect tenses in BrE and with the simple past in NAmE. * just 在英式英语中多与完成时连用，在美式英语中则多与一般过去时连用：◆(BrE) I've just had some bad news.◆(NAmE) I just got some bad news.我刚得到个坏消息。
🔑 () now; assoonasthis现在；即刻；马上◆Don'tgoyet. 先别走。◆Wedon'tneedtostartyet. 我们不必马上开始。🔑fromnowuntiltheperiodoftimementionedhaspassed从现在起直至某一时间；还◆He'llbebusyforagesyet. 他还要忙很长一段时间。◆Theywon'tarriveforatleasttwohoursyet. 他们至少要过两个小时才能到。could, might, may, etc. dosth~usedtosaythatsthcould, might, etc. happeninthefuture, eventhoughitseemsunlikely（表示将来可能发生，尽管现在似乎没有可能）早晚，总有一天◆Wemaywinyet. 我们迟早会赢的。◆(formal) Shecouldyetsurpriseusall. 总有一天，她会让我们都大吃一惊。🔑thebest, longest, etc. sth~ (done)thebest, longest, etc. thingofitskindmade, produced, written, etc. untilnow/then迄今为止，到当时为止（最好或最长等的）◆themostcomprehensivestudyyetofhismusic迄今为止对他的音乐最为全面的研究◆Itwasthehighestbuildingyetconstructed. 这是到当时为止所建的最高的建筑物。🔑~another/more | ~againusedtoemphasizeanincreaseinnumberoramountorthenumberoftimessthhappens（强调次数或数量的增加）◆snow, snowandyetmoresnow下雪，下雪，还要下雪◆yetanotherdietbook又是一本关于节食的书◆Priceswerecutyetagain(= oncemore, aftermanyothertimes). 物价再一次降低。~worse, moreimportantly, etc.usedtoemphasizeanincreaseinthedegreeofsth(= howbad, important, etc. itis)（强调程度的增加）更SYNeven, still◆arecentandyetmoreimprobabletheory一个新近提出的但更加不切实际的理论●asˈyet🔑untilnoworuntilaparticulartimeinthepast直到现在；直至过去某时◆anasyetunpublishedreport一篇尚未发表的报告◆Asyetlittlewasknownofthecausesofthedisease. 当时人们对这种疾病的起因几乎一无所知。
