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1、Unit 6 Enjoying Cycling Topic 2 How about exploring Tiananmen Square?Section B-while、when、as用法while,when,as 用法：用法：一、一、while的用法的用法1.引导时间状语从句，意为引导时间状语从句，意为“当当时候时候”“在在期间期间”。His parents died while he was at school.2.引导时间状语从句，意为引导时间状语从句，意为“与与同时同时”。You may go swimming while Im having lunch.3.引导让步状语从句引导让步状
2、语从句(需置于主句之前需置于主句之前)，意为，意为“虽然虽然”“尽然尽然”。While Im willing to help,I dont have much time available.4.用作并列连词，表示前后两个分句用作并列连词，表示前后两个分句之间的之间的对比对比，意为，意为“然而然而”。He likes listening to music,while I enjoy watching TV.二、二、when的用法的用法1.引导引导让步让步状语从句：状语从句：although 虽然，虽然，然而，可是然而，可是Im saying it now when I should have t
3、old you long ago.我早就应该告诉你了，可是我现在才说。我早就应该告诉你了，可是我现在才说。2.引导引导时间时间状语从句：状语从句：at/during/after the time that 在在/当当时；在时；在之后之后I loved math when I was at school.我在学校时喜欢数学。我在学校时喜欢数学。Call me when youve finished.你完成后打电话给我。你完成后打电话给我。3.引导引导原因原因状语从句：状语从句：considering that考虑到，既然考虑到，既然How can they expect to learn any
4、thing when they never listen.既然他们从不听讲，他们怎么能指望学到既然他们从不听讲，他们怎么能指望学到东西呢？东西呢？4.引导引导条件条件状语从句：状语从句：if 如果如果When the weather is good,I usually go to the country.若是天气好的话若是天气好的话,我总是我总是到乡下去。到乡下去。5.连接并列句：连接并列句：after which;and just then 一一就就，正在这时，正在这时He had just drifted off to sleep when the phone rang.他刚迷迷糊糊地睡下
5、，这时电话铃就响了。他刚迷迷糊糊地睡下，这时电话铃就响了。三、三、as的用法的用法1.引导引导时间时间状语从句：状语从句：during the time when;while 在在期间；当期间；当时候时候As she grew older,she kept more to herself.随着年龄的增长，她变得更沉默了。随着年龄的增长，她变得更沉默了。I was coming in as he was going out.我进来的时候我进来的时候,他正出去。他正出去。2.引导引导原因原因状语从句：状语从句：because;since 由于；因为由于；因为I must stop now as I
6、 have to go out.我得就此打住了，因为我得出去。我得就此打住了，因为我得出去。3.引导引导让步让步状语从句：状语从句：although 尽管，尽管，虽然虽然 Sweet as he is,he doesnt pay his bills.他虽然和蔼可亲，却不买账。他虽然和蔼可亲，却不买账。Try as he might,he failed to pull it off.虽然他一试再试，却没有成功。虽然他一试再试，却没有成功。4.引导引导方式方式状语从句：状语从句：in the way in which 以以方式；像方式；像一样一样They can do as they wish.他
7、们能随心所欲。他们能随心所欲。She kissed him goodbye,as usual.她同平常一样和他吻别。她同平常一样和他吻别。5.用于在陈述中增加或插入评论用于在陈述中增加或插入评论 正如正如As you can see,I didnt go after all.你看，我毕竟没有去。你看，我毕竟没有去。while,when与与as用法辨析：用法辨析：(1)while引导时间状语从句作引导时间状语从句作“当当时时候候”讲时，只能与讲时，只能与延续性延续性动词连用。动词连用。(2)when引导时间状语从句作引导时间状语从句作“当当时时候候”讲时，既可与讲时，既可与延续性延续性动词也可与
8、动词也可与瞬间瞬间动词动词连用。连用。(3)as强调主从句谓语动词表示的动作强调主从句谓语动词表示的动作同同时进行时进行，意为，意为“一边一边一边一边”。它。它还有还有“随着随着”的意思。的意思。while,when与与as用法辨析：用法辨析：(1)While he was reading,he fell asleep.(2)When he came in,I was having lunch.When I was sleeping,a thief broke in.(3)He looked behind from time to time as he walked.As time went by,she became more and more nervous.Goodbye！