Unit 5 Operation andMaintenance Grammar课件 2024-2025学年中职英语高教版（2023修订版）工科类职业模块
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内容正文：
Operation and
Maintenance
Unit 5
Professional Module（修订版）
06
Grammar
时间状语从句
2
When it is fine, we'll go sailing.
While we are sailing in the sea, we can see many dolphins.
As the sun rises, it will be another day.
连词1：时间状语从句（1）
As the sun rises, it will be another day.
While we are sailing in the sea, we can see many dolphins.
When it is fine, we'll go sailing.
时间状语从句（1）：
when:持续性动词或非持续性动词
while:持续性动词
as:当；一边……一边；随着
as/while/when
注意：当主句是表将来时，从句用一般现在时表将来。主将从现
As soon as/The moment I find you, I'll feel very happy.
It is not until the sun sets that we go back home.
连词2：时间状语从句（2）
As soon as/The moment I find you, I'll feel very happy.
It is not until the sun sets that we go back home.
时间状语从句（2）：
as soon as/the moment:一……就……
not until:直到……才……
as soon as / the moment /not until
Before the sun rises, we go out to play.
After the sun sets, we go back home.
Since I was born, I have been taken good care of by my mum.
连词3：时间状语从句（3）
Before the sun rises, we go out to play.
After the sun sets, we go back home.
Since I was born, I have been taken good care of by my mum.
时间状语从句（3）：
before:在……之前
after:在……之后
since:自从……；主句谓语常用现在完成时
before / after / since
用法归纳
1. 时间状语从句
(1) 时间状语从句常用 when, as, while, before, after, since, till, until, as soon as 等连词来引导。
例如：
1. It was raining hard when we got to school yesterday.
2. While he was doing his homework, the telephone rang.
3. As he walked along the lake, he sang happily.
4. He had learned a little Chinese before he came to China.
5. After he finished middle school, he went to work in a factory.
(2) 在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或状态。
例如：
1. I’ll ring you up as soon as I get to New York.
2. I will tell him everything when he comes back.
3. He won’t believe it until he sees it with his own eyes.
(3) 在带有 till 或 until 引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是 “ 一直到 …… 时 ” ，谓语动词只能用延续性动词。
如果主句用否定式，"not.....untill" 其含义是 “ 直到 …… 才 ……”, “ 在 …… 以前不 ……”, 谓语动词可用瞬间动词。
例如：
1. The young man read till the light went out.
2. Let’s wait until the rain stops.
3. We won’t start until Bob comes.
4. Don’t get off until the bus stops.
[Practice] I didn ’ t know he came back ____ I met him in the street.
A. since B. When C. until D. after
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