通常ALREADY用于肯定句,YET用于否定和疑问句,例如:
I have already finished my homework.
I haven't finished my homework yet.
I am already in Grade three, Junior.
Haven't you worked out the probelm?
但是当ALREADY表示更强烈语气或者特殊语气时,可以用在疑问句,请对比理解如下句子:
Have you finished your work yet?(普通一个问题,就是问工作是否进行完了)
Have you finished your work already?(表达了问话人"这么快你就完成了工作,真不可思议"的惊讶语气)
另外要留意这两个词在句中的位置:
通常ALREADY靠近谓语动词,而YET往往放在句末.位置如果有变化,语气一般也有变化.如:
I have already sung!
I have sung already!
He is not home yet.
He is not yet home.
希望能帮到你.
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