定义

时间状语从句是指在句子中修饰主句的时间状语，用来表示主句中的动作发生的时间、顺序或持续时间。时间状语从句通常由连词when、while、as、before、after、since、until等引导

基本用法

表示某个时间点或时间段
when、after、before、until、as soon as、while、since等连词引导的时间状语从句可以用来表示某个时间点或时间段。例如：
When she arrived, we started the meeting.
I’ll call you as soon as I finish the report.
Since I started working here, I have learned a lot.

表示某个动作的持续时间
while、as等连词引导的时间状语从句可以用来表示某个动作的持续时间。例如：
While I was watching TV, the phone rang.
As she was studying, she heard a loud noise.

表示顺序
when、before、after等连词引导的时间状语从句可以用来表示顺序。例如：
Before you go to bed, brush your teeth.
After he finished his work, he went home.

注意事项

时间状语从句通常位于主句之前，使用逗号隔开。
When she arrived, we started the meeting.

当主句的主语和时间状语从句的主语不同时，时间状语从句要使用相应的主语从句或者用相应的宾格代词。例如：
After he finishes his work, he will go home.（he是主语）
After we finished our work, he joined us for dinner.（we是主语，所以用we的宾格our）

时间状语从句使用的时态需要与主句的时态相对应。
If it rains, I will stay at home.（主句使用一般将来时，从句使用一般现在时）即：主将从现
I called you as soon as I got off the plane. 主过从过

Mindmap解析

习题-Exercises

现在让我们通过一些练习来巩固时间状语从句的使用。请根据主句和时间状语从句的意思，填写正确的连词。

1.I will call you as soon as __________ (I arrive / I arrived / I have arrived / I had arrived).

2.__________ (While / When / After / Before) I was driving to work, I saw a car accident on the highway.

3.We can have dinner together __________ (when / if / unless / because) I finish my work on time.

4.My sister won't be able to come to the party __________ (unless / as soon as / even though / whenever) she finishes her homework.

5.I will wait for you __________ (until / since / while / after) you finish your meeting.

6.__________ (After / Before / When / While) I was studying for the exam, my phone rang several times.

7.The concert will be canceled __________ (in case / unless / as long as / although) it rains.

8.I will send you the report __________ (as soon as / while / because / even though) I have finished writing it.

9.__________ (Once / Whenever / If / Although) I see her, I will ask about her trip.

10.We should get to the airport early __________ (in order that / as soon as / although / as long as) we don't miss our flight.

KEYS

I arrive
When/While
When
Unless
Until

While/When
Unless
As soon as
Whenever
In order that