时间状语从句有主情从现吗（状语从句中的时间状语从句是怎样的）

时间状语从句

①when

1. 意为“当…时”, 从句的动词可用延续性动词，也可用非延续性动词

When I came into the room, he was writing a letter.

2. 意为“这时”或“在那时”

I was walking along the street when suddenly Tom patted me on the shoulder.

②while

1. 意为“在某一段时间里”， “在…期间”； while 引导的动作必须是持续性的

While it was raining, they went out.

2. 意为“然而”

I stayed while he was away.

All of us are working hard while he is sleeping.

③as

1. 意为“一边...一边”，引导持续性动作，强调主句和从句的动作同时发生

He hurried home, looking behind as he went.

2. 意为“随着”

As time goes by, I like China better.

④before

意为 “在…之前, 才, 就”

Be a pupil before you become a teacher.

I finished my task before I went home.

⑤after

意为“在…之后”

He arrived after the game started.

⑥till / until

1. 若主句动词是持续性动作，常用肯定式，表示“直到…为止”

We waited till /until he came back.

2. 若主句动词是瞬间动词，要用否定式 not…until 表示“直…才”

She didn't stop working until eleven o'clock.

Not until eleven o'clock did she stop working.

⑦since

1. 意为“自从…以来”， 主句常用现在完成时，从句用一般过去时

Great changes have taken place in China since 1978.

She has taught in this school since she came to this city in 1989.

2. it's 时间 since 从句

It's three years since she came to this city.

⑧as soon as

意为“一…...就”

As soon as I arrive in Shanghai, I'll write to you.

时间状语从句的时态

1. 主句一般将来时，从句用一般现在时 (主将从现)

The boy will be a writer when he grows up.

2. 主语含有情态动词，从句用一般现在时 (主情从现)

When the lights are red, the traffic must stop.

3. 主句为祈使句，从句用一般现在时 (主祈从现)

Please don't go to bed before you finish your homework.

4. 主句为一般过去时，从句也用过去时态 (主过从过)

I liked reading when I was young.

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