状语从句精讲PPT课件
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When the children had gone to bed, she began to prepare her lessons.
We had sailed four days and four nights before we
saw land. “……才”
We hadn’t run a mile before he felt tired.
had just done sth
I was walking along the street , when I met him
I was about to fall asleep when my sister came in.
3. 还可以表示原因“既然”，相当于since; considering
句型It will be/was＋一段时间＋before…“还 要过多久才……”
3. while可表示尽管，相当于although。
※while 含义：
While I was walking down the street, I came across an old friend. ( while =__w_h_e_n__)
He likes pop music, while I am fond of folk
“不到……就”
Please write it down before you forget it.
“趁……”
Before I could get in a word, he had measured me.
“还没来得及”
Before从句中谓语不用否定式
Before they reached the station, the train had gone.
music. ( while =_b_u__t ___)
While I really don’t like art, I find his work impressive. (while=__a_lt_h_o_u_g_h___)
While there is life there is hope. (while=___a_s_l_o_n_g_a_s_____)
Please don’t talk so loud while others are working.
2. while作为并列连词，意为“而，却”，侧重 主句动作和从句动作相对比。
We are cleaning the classroom while they are playing the football.
状语从句精讲
在复合句中由从句表示的状语称作 状语从句，它可以用来修饰谓语或 是整个句子。
状语从句
时间状语从句
地点状语从句
状
原因状语从句
语
目的状语从句
从
结果状语从句
句
条件状语从句
方式状语从句
让步状语从句
比较状语从句
时间状语从句
引导时间状语从句的连词有：
when, while, as, the moment, before, after, till, until, since, as soon as 等。
I will tell him when he comes back.
连接词when的用法小结
1. when引导的时间状语从句的谓语动词
可以是可延续
也可以是表短暂性动作的动词(非延续性)。
如When the film ended, the people went back.
When I lived there, I used to go to the seashore.
1．while引导的时间状语从句的谓语动词必须是 可延续的， 而when引导的时间状语从句的谓语 动词是可延续的，也 可以是表短暂性动作的动词。 When/While he was eating his breakfast, he heard the doorbell ring.
When I stopped my car, a man came up to me.
1 when引导的时间状语从句的谓语动词 可以是延续性动词
也可以是表短暂性动作的动词(非延续性)。
When the film ended, the people went back.
When I lived there, I used to go to the seashore.
2 when表示 “就在这时” 在下列结构中，表示某件 事正在发生或刚刚发生，另一动作同时发生。 be about to do… when… be doing… when… had done… when…
When/While/As I was walking down the street, I came across an old friend of mine.
4.从句动作发生在主句动作之前时，只能用 when引导这个从句，不可用as或while。
When you have finished your work, you may have a rest.
(不可延续，短暂性动词，只可以用when，不 可用while)
2．表示“随着……”，连词用as，不用when 或while。
As the day went on, the weather got worse.
3如果主句表示的是短暂动作，而从句用延续 性动作的进行时态表示在一段时间内正在进行 的动作时，when, while 与as 可互换使用。
We were about to start when it began to rain.
I was playing computer games when mom came in.
1. while引导的动作必须是持续性的，在……期间， 往往指一段时间。如： While we were talking, he came in.
2. 可用作并列连词，其意义为“那时，这时”，相当于
and at this/that time。常用于下列句式：
(刚要……这时突然……) 记忆
Sb. was doing something
was about to do sth
+ when…
was on the point百度文库of doing sth.
We had sailed four days and four nights before we
saw land. “……才”
We hadn’t run a mile before he felt tired.
had just done sth
I was walking along the street , when I met him
I was about to fall asleep when my sister came in.
3. 还可以表示原因“既然”，相当于since; considering
句型It will be/was＋一段时间＋before…“还 要过多久才……”
3. while可表示尽管，相当于although。
※while 含义：
While I was walking down the street, I came across an old friend. ( while =__w_h_e_n__)
He likes pop music, while I am fond of folk
“不到……就”
Please write it down before you forget it.
“趁……”
Before I could get in a word, he had measured me.
“还没来得及”
Before从句中谓语不用否定式
Before they reached the station, the train had gone.
music. ( while =_b_u__t ___)
While I really don’t like art, I find his work impressive. (while=__a_lt_h_o_u_g_h___)
While there is life there is hope. (while=___a_s_l_o_n_g_a_s_____)
Please don’t talk so loud while others are working.
2. while作为并列连词，意为“而，却”，侧重 主句动作和从句动作相对比。
We are cleaning the classroom while they are playing the football.
状语从句精讲
在复合句中由从句表示的状语称作 状语从句，它可以用来修饰谓语或 是整个句子。
状语从句
时间状语从句
地点状语从句
状
原因状语从句
语
目的状语从句
从
结果状语从句
句
条件状语从句
方式状语从句
让步状语从句
比较状语从句
时间状语从句
引导时间状语从句的连词有：
when, while, as, the moment, before, after, till, until, since, as soon as 等。
I will tell him when he comes back.
连接词when的用法小结
1. when引导的时间状语从句的谓语动词
可以是可延续
也可以是表短暂性动作的动词(非延续性)。
如When the film ended, the people went back.
When I lived there, I used to go to the seashore.
1．while引导的时间状语从句的谓语动词必须是 可延续的， 而when引导的时间状语从句的谓语 动词是可延续的，也 可以是表短暂性动作的动词。 When/While he was eating his breakfast, he heard the doorbell ring.
When I stopped my car, a man came up to me.
1 when引导的时间状语从句的谓语动词 可以是延续性动词
也可以是表短暂性动作的动词(非延续性)。
When the film ended, the people went back.
When I lived there, I used to go to the seashore.
2 when表示 “就在这时” 在下列结构中，表示某件 事正在发生或刚刚发生，另一动作同时发生。 be about to do… when… be doing… when… had done… when…
When/While/As I was walking down the street, I came across an old friend of mine.
4.从句动作发生在主句动作之前时，只能用 when引导这个从句，不可用as或while。
When you have finished your work, you may have a rest.
(不可延续，短暂性动词，只可以用when，不 可用while)
2．表示“随着……”，连词用as，不用when 或while。
As the day went on, the weather got worse.
3如果主句表示的是短暂动作，而从句用延续 性动作的进行时态表示在一段时间内正在进行 的动作时，when, while 与as 可互换使用。
We were about to start when it began to rain.
I was playing computer games when mom came in.
1. while引导的动作必须是持续性的，在……期间， 往往指一段时间。如： While we were talking, he came in.
2. 可用作并列连词，其意义为“那时，这时”，相当于
and at this/that time。常用于下列句式：
(刚要……这时突然……) 记忆
Sb. was doing something
was about to do sth
+ when…
was on the point百度文库of doing sth.