you your work yet?Yes,I it half an hour ago.

这主要考yet用于完成时态中
一,yet通常用于否定句或疑问句中,译为"还,尚,仍,已经"等.常常放于句末,否定词之 后.1.yet大多用于完成时态中.例句:(1)Have you heard from him yet?你收到他的信了吗?(2)Has he come yet?No,not yet.他已经来了吗?不,还没有.2.yet也可以用于一般现在时.例句:(1)He is not yet here.他还未到.(2)Is the tea cold yet?茶凉了吗?请比较下面两个例子:Is she here yet?(=Has she arrived?)她已经到了吗?Is she still here?(=Hasn't she gone yet?)她还在这里吗?
二,yet还可以用于肯定句中,译为"还,仍然",相当于still,在口语中常用still.例句:1.She is yet a children.她还是个孩子.2.I have yet much to do.我还有许多事情要做.
三,yet与比较级和once,again等连用,相当于still或even,译为"更"和"再".yet与* 连用,译为"到目前(或当时)为止(最.)".例句:1.You must work yet harder.你工作还要更努力.2.Say it yet once more,please.请再说一次.3.This is the biggest lake yet discovered.这是目前为止已发现的最大的湖泊.
四,yet可以表示将来还有可能发生的事.例句:1.He will win yet.他还会赢的.2.It may yet succeed.它迟早会成功的.
五,yet也可以作连词,译为"可是","然而".例句:1.He worked hard,yet he failed.他工作努力,可是失败了.2.The room is small,yet very comfortable.房间小,但非常舒适.在口语中,yet也可以与and连用产生转折语气.例句:1.He hunted for jobs in Beijing for months,and yet he couldn't find any work.他 在北京找工作已有几个月了,可是他仍然找不到工作.2.He says he is full,and yet he wants more.他说他吃饱了,可是他还要.yet与not连用,译为"仍不,也不".例句:She didn't come,not telephone yet.她没来,电话也没有.
六,与yet有关的短语.1.as yet意思为"到那时,迄今",多用于否定句中.例句:As yet,he had not become famous.那时,他还没有出名.2.not...nor yet译为"不.也不".例句:I do not like red nor yet yellow.我不喜欢红色,也不喜欢黄色