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1、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 dided 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 avai
2、ble.4. 用作并列连词,表示前后两个分句之间用作并列连词,表示前后两个分句之间的的对比对比,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 told 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
3、/ after the time that 在在/当当时;在时;在之后之后I loved maths 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 anything 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.
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,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: dur
5、ing 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 由于由于;因为;因为I must stop now as I 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
6、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. 他们能随心所欲。他们能随心所欲。 She kissed him goodbye, as us
7、ual. 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
8、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.