引导词可分为两部分．
as while when whenever before after until (till) since as soon as
every time next time the first/…time the moment the minute/… instantly immediately directly (一…就…)
1. as, while , when的区别
as引导的时间状语从句, 可以表达“正当……”， “一 边……一边……”，“随着……”等意思。 1. 表示某事一发生，另一事立即发生。
As the sun rose, the fog disappeared. 2. 表示在某事发生的过程中，另一事发生。
Just as he was speaking there was a loud explosion.
状语时用来修饰 动 词， 形容 词， 副 词或 的一种句子成分。它可以表示时间、地点、
句子 原因、目的、结果、条件、让步、比较、方式等。 当充当状语的部分是一个句子时，也就是状语从
句。分类如下：
状语从句
1. 时间状语从句 2. 地点状语从句 3. 原因状语从句 4. 条件状语从句 5. 让步状语从句 6. 目的状语从句 7. 结果状语从句 8. 方式状语从句 9. 比较状语从句
while:持续性动词 ／进行时
＊一般或现在情况
e.g. I like listening to music while I am doing my homework.
＊将来情况－V一般现在时或现在进行时
e.g.— I’m going to the post office. -- While you are there, can you get some
While I reallywhdeonn’t like art, I find his work impressive. ( while =_________ )
While there is life there is hope. (whilaelt=ho_u_g_h_______ )
He likes music.
3. 表示两个动作同时发生。 Helen sang a song as she washed.
4. 表示“随着…..”.常指一个行为是另一个行为的结果， 或一种状态随另一种状态变化。句中的动词多表示状态 的发展变化。As she grew older, she became more beautiful.
stamps for me?
＊过去情况
e.g. I hurt my should while I was doing gym.
While 在句中的不同含义:
While I was walking down the street, I came across an old friend. ( while=_______)
常用句型：It has been (is) + 时间段 + ห้องสมุดไป่ตู้ince从句 “自从……有多长时间了 ”
例句翻译：自从她大学毕业已经有六年时间了。 It has been (is) six years since she graduated from the university.
until/ till引导的时间状语从句
After you use plastic bags, you mustn’t throw them about.
since引导的时间状语从句
◆ since引导的时间状语从句，常译为“自从……”， 主句常用现在完成时，从句常用一般过去时。 例句翻译：我们自从分手以后一直没见过面。
We haven’t seen each other since we parted.
We clean the classroom before we leave school every day.
It will not be long before you regret for what you’ve done.
after引导的时间状语从句
◆ after引导的时间状语从句，常译为“在……之后”， 表示主句的动作发生在从句的动作之后。
e.g. He walks when he might take a taxi. 虽然
The Queen will visit the town in May, when she will open the new hospital. 届时
How can you hope for mercy yourself when
◆ until / till 引导的时间状语从句，常译为“直到……时”， 表示主句动作发生在从句之前。 ◆当主句谓语动词是延续性动词时，主句常用肯定形式。
例句：我会待在这里，直到你回来。 I’ll stay here until you come back. ◆当主句谓语动词是非延续性动词时, 主句常用否定形式。 not… until…“直到……才……”，这时until 可用before替换。
pop
masulsoincg,
awshile
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am
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of
folk
when: 持续性／非持续性动词都可
＊当……时
e.g. When I first saw her, I fell in love with her. ---When did you get home? ---It was eight o’clock when I got home.
you show none?
如果
How could I live in Los Angeles when all my
favorite people live here? 鉴于, 既然
before引导的时间状语从句
◆ before引导的时间状语从句，常译为“在……之前”， 表示主句的动作发生在从句的动作之前。
＊正在……忽然
1) They were walking down the street when they saw an accident.
2) I was about to go swimming when our guide stopped me.
when 还有一些较为灵活的翻译:
＊尽管／虽然／鉴于／如果／届时／