yet

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yet用于否定句和疑問句中及用于表示懷疑的動詞之后,意思是“還,尚,仍然,直至現(xiàn)在”,在英式英語中通常用于現(xiàn)在或過去完成時,在美式英語中通常用于一般過去時。
yet用于疑問句中,還可作“已經(jīng)”“還”“仍然”解,通常放在句末。
yet用于肯定句中,可表示“還”“尚”,有時含有“還為時太早”之意; 與形容詞或副詞的比較級連用時意為“甚至,更”“還要”,與最高級連用意為“到目前〔當(dāng)時〕為止(最…)”。
yet還可與表示未來含意的情態(tài)習(xí)語be to或have to連用構(gòu)成“be yet to”或“have yet to”結(jié)構(gòu)。
在美式英語中, yet可用在感嘆句中。

(UNTIL NOW) still; until the present time
(IN THE FUTURE) from now and for a particular period of time in the future
(EVEN NOW) even at this stage or time
(MORE) used to add emphasis to words such as another and again, especially to show an increase in amount or the number of times something happens
(and) despite that; used to add something that seems surprising because of what you have just said

You use yet in negative statements to indicate that something has not happened up to the present time, although it probably will happen. You can also use yet in questions to ask if something has happened up to the present time.
You use yet with a negative statement when you are talking about the past, to report something that was not the case then, although it became the case later.
If you say that something should not or cannot be done yet, you mean that it should not or cannot be done now, although it will have to be done at a later time.
You use yet after a superlative to indicate, for example, that something is the worst or the best of its kind up to the present time.
You can use yet to say that there is still a possibility that something will happen.
You can use yet after expressions that refer to a period of time, when you want to say how much longer a situation will continue for.
If you say that you have yet to do something, you mean that you have never done it, especially when this is surprising or bad.
You can use yet to introduce a fact that is rather surprising after the previous fact you have just mentioned.
You can use yet to emphasize a word, especially when you are saying that something is surprising because it is more extreme than previous things of its kind, or a further case of them.
You use as yet with negative statements to describe a situation that has existed up until the present time.