As we all know, Zhou Hao is a good Teacher.
你看，我毕竟没有去。
• as 引导比较状语从句： as + adj + as as much as not so much as
• as 作副词：同样 • This book is pretty difficult, that one is as difficult. • • • • • as的固定搭配 as well 也 as a whole 作为一个整体 as yet 迄今，到目前为止 see …as 把…看做… regard … as think of … as
3. 引导让步状语从句(需置于主句之前)， 意为“虽然”“尽然”。 While I’m willing to help, I don’t have much time available. 4. 用作并列连词，表示前后两个分句之间 的对比，意为“然而”。 He likes listening to music, while I enjoy watching TV.
4. 引导方式状语从句：in the way in which 以……方 式；像……一样 They can do as they wish. 他们能随心所欲。 She kissed him goodbye, as usual. 她同平常一样和他吻别。
5. 引导定语从句 正如…
As you can see, I didn't go after all.
5. 连接并列句：after which; and just then 一……就……，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。
三、as的用法
1. 引导时间状语从句： during the time when; while 在……期间；当……时候 As she grew older, she kept more to herself. 随着年龄的增长，引导时间状语从句：at / during / after the time that 在/当……时；在……之后 I loved maths when I was at school. 我在学校时喜欢数学。 Call me when you've finished. 你完成后打电话给我。 2. 引导让步状语从句：although 虽然，然而，可是 I'm 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。
while, when与as用法辨析：
(1) while引导时间状语从句作“当……时候” 讲时，只能与延续性动词连用。
(2) when引导时间状语从句作“当……时候” 讲时，既可与延续性动词也可与瞬间动词连 用。 (3) as强调主从句谓语动词表示的动作同时 进行，意为“一边……一边……”。它还有 “随着……”的意思。
3. 引导原因状语从句：considering that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东西呢？
4. 引导条件状语从句：if 如果
When the weather is good, I usually go to the country. 若是天气好的话, 我总是到乡下去。
while的用法 引导时间状语从句
1. 引导时间状语从句，意为“当……时 候”“在……期间”。 His parents died while he was at school. You may go swimming while I’m having lunch.
2. 引导时间状语从句，意为“与……同时”。
While 的其他词性
• • • • • • • n.一会儿时间 stay for a while. 停留一会儿。 Wait a while. 等一会儿。 The project wasn't worth my while. 这项方案不值得我花工夫。 v.消磨：闲散或轻松地消磨时间 while the hours away.
I was coming in as he was going out.
我进来的时候, 他正出去。
2. 引导原因状语从句：because; since 由于；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。 3. 引导让步状语从句：although 尽管，虽然 Sweet as he is, he doesn't pay his bills. 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。
while, when与as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.