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将来情况（从句谓语可用一般现在时或现在进行时）。
I will be
kind to him while you are away.你不在时我会对他好的。
I am going
to the postoffice. ---while you are therecan you get me some stamps?我要去邮局了。---你在那儿时，帮我买些邮票好吗？
I will get
something to eat while you are finding the book.你找书时我要拿点东西吃。
3. 过去情况（时态主要有下面三种情况）。
1主句和从句谓语都用一般过去时。
A letter
came here for you while you were ill.你生病时来了封你的信。
She listened
carefully while he read the letter.他读信时她仔细听着。
2. 从句谓语用过去进行时，主句谓语用一般过去时。
I hurt my
left shoulder while I was doing gym.. 我做操时伤了左肩膀。
While I was
windering at thisour master took his place. 我正对这感到纳闷时，我们的老师就座了。
3主句和从句谓语都过去进行时。
While people
in other countries were trying to catch animals farmers in China were
developing the science of agriculture. 当世界上其他国家的人们还在捕猎时，中国的农民已经在从事农业科学研究了。
When 引导的时间状语从句既可用持续性又可用非持续性动词。
1When只是单纯的表示动作的时间，意为“当…时”。
When he
answers questions it takes about two minutes.他回答问题时大约要花两分钟时间。
Are you
going to be a sailor when you leave school? 你毕业后想当个海员吗？
2when 引导的时间状语从句还表示突然发生某事，意为“正在……忽然”。
Tom and
susan were walking down the street when they saw an accident.汤姆和苏三正在街上走，忽然看到一场意外事故。
I was about
to go swimming when our guide stopped me. 我正要去游泳，这时向导把我拦住了。
3when引导的时间状语从句还可以表示过早的发生某事，意为“还没（刚刚）… 就”，这时连词before也可以这么用，表示出现意想不到的情况。
He had gone
through six carriages （before）when he found he
could go no further. 他走过了六节车厢，这时他发现再也走不过去了。
She had not
been married many weeks when that man’s younger brother saw her and was struck
by her beauty.她结婚刚刚几个星期，那个人的弟弟就看见了她，并且被她的美貌所吸引。
Someone
called up in the middle of the night but they hung up before(when) I could
answer the phone。有人半夜打来电话，但是没等我接就挂断了。
4when还有“尽管，虽然，既然，鉴于，如果，届时，在那时”等意思。
He walks
when he might take a taxi.虽然他可坐出租车，不过他还是步行。
How could I
live in Los Angeles when all my favorite people live here? 既然我最喜欢的人都在这里，我怎能住在洛杉矶呢？
How can you hope for mercy yourself when you
show none? 如果你不宽恕别人，你自己怎能希望得到别人的宽恕呢
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