when和while引导的时间状语从句与这一时态连用54622

1、when和while引导的时间状语从句与这一时态连用。所 以区别when和while的用法成了这一单元的难点。（一）、when, while都有“当时候的意思。when既可表示某一点时间，也可以表示某一段时间。在when引导的时间状语从句中，其谓语动词可以是延续 性的，也可以是非延续性的，可与主句中的谓语动词同 时发生，也可在其后发生。例如：1 I was just reading a book when she came into my room.她走进我房间时，我正在看书。2、Were you wr iting when the teacher came in?老师进来的时候，你在写信吗？

2、3、When he was a chi Id he was always trying out new i deas.他小时候就常常试验一些新的设想。（二）、whi le只能表示某一段时间，不能表示某一点时 间。在whi le引导的时间状语从句中，其谓语动词只能 是延续性的，而且也只能与主句中的谓语动词同时发生 或存在。例如：1 Whi Ie Jim was mending his bike, Lin Tao came to see him.正当吉姆修自行车时，林涛来看他。2、You can t do your homework while you re watch i ng TV.你不能一边

3、看电视一边做家庭作业。（三）、另外，when和while的区别还在于：while引 导的时间状语从句多用进行时态，而when引导的时间状 语从句多用一般时态。例如:1 While t hey were t a I k ing , the b e I I rang.正在他们谈话的时候，上课铃响了。2、I was doing my homework whe n my mot her came back home yesterday evening.昨天晚上妈妈回家的时候，我正在做家庭作1. she comes , I sha I It e I I her towa i t for you.A. W

4、henB. As C. WhileD.What2. she got older, she got wiser.A. WhenB. As C. WhileD.That3. Peter was reading , his wife wascook ing.A. WhenB. As C. WhileD.Thatwhenas while when表示较短的时间，有的时候也可以指一段时间。 如：When he was young, he could do eat much more than hi s brother. whi le常表示一段较长的时间，强调主句谓语动词与 从句谓语动词同时发生。安口：你

5、的第三道题就是这样。只用as,不用when或while的时候。A）用于表示同一个人的两种动作交替进行，指”一边，一边o如：The girl dances as she sings on the stage.B）表示两个同步发展的动作或行为，译为”随着no 如：As time went on, she became more and more worr ied.when和while的区别都表示“当时候”的区别。请观察以下句子：While in Vienna he studied music.他在维也纳时学习音乐。While he was eating, I asked him to lend m

6、e $2.当他正在吃饭时，我请他借给我二英镑。While two detect i ves were keep i ng guard at the door, twoothersopened the parceI.这时两个侦探把着门，另外两个打开包裹。While I read, she sang.我看书时，她在唱歌。I met her while I was at school.当我在学校的时候我遇见了她。Ed i son was not a good student when he was a young boy.爱迪生小时候不是一个成绩好的学生。When the p I ane ar r

7、i ved, some of the detect i ves were waiting inside the main bui Iding whi le others were waiting on the ai rfield.当飞机抵达时，一部分侦探等在主楼里面，而另一部分则 等在停机坪上。When I came home my wife was cooking dinner. 我回家时，妻子在做晚饭。通过观察，我们可以这样理解：when引导的从句里动作 发生的时间相对主句动作发生的时间要短些；whi le引 导的从句里的动作发生的时间相对主句而言更长些。333 as, when, whi

8、le 意为 a I though （尽管），but （但是），seeing that （鉴于）A只有在 形容词+as+主语+to be / to seem / to appear 这一结构中，as 才意为 though / a I though （尽 管）：Ti red as he was he offered to carry her 相当 于：Though he was tired he offered to carry her 尽管他很累了，他还主动提出要背着她。Strong as he was, he couldn, t lift it.尽管他力气很大，他仍提不起这个东西。B whi

9、le可意为but,用于表示强调对比：At sea，mea ns on a ship , while att he seaT means at the seaside “At sea”意为“在船上”,而“at the sea”意为 “在海滩上”。Some peopIe waste food while others haven t enough.一些人糟踏食物而另一些人却食不果腹。while可以意为a I though,这时常放在句首：While I sympathize with your point of view I cannot accept it.尽管我认同你的观点，但我不能接受它。C

10、 when 可以意为 seeing that / a I though （鉴于）。 因此它同while很相似，但主要用于引导使另一个动作 显得不合理的陈述句。它常用在一个问句里，但不是一定如此：How can you expect your ch i I dren to be truthfu I when you yourself tel I lies?你自己都在撒谎，怎么能指望你的孩子们诚实？It s not fair to expect her to do a I I the cook i ng when she has had no training or experience她没有受过烹调方面的训练，也没有这方面的经验， 让她把做饭的事