as引导时间状语从句，主句和从句应用什么时态？

Question

是不是都用进行时？

Answer 1

As作连词引导时间状语从句时,着重强调主句和从句中的动作同时发生,并且从句通常放在主句之前。归纳起来有下列两种情况:
1)状语从句的谓语动词是持续性动词,从句时态常用进行时态。
如: ①As he Was waiting,he suddenly heard a voice from above……
②As Bethune and the other doctors were climbing the hills,they could see the enemy entering the village in the valley below.
2)状语从句的谓语动词是终止性动词,从句时态常用一般时态。
如: ①As she stood there,she heard the first bell.
②As they looked up,they saw another cloud coming towards them.
③As they watched.it came nearer and nearer.追问

有没有 as的主句和从句都用 进行时的句子？

追答

没有

Answer 2

as副词 adv.
1.同样地, 一样地
She is as tall as her mother.
她和她母亲一样高。
The dining room was twice as big as the Tom's.
这个餐厅比汤姆的餐厅大一倍。
This is as difficult a problem as you are likely to meet.
像这样的难题, 你可能会碰到。
介词 prep.
1.(表示时间)当还是…的时候
As a schoolboy, he showed every sign of genius.
当他还是个小学生的时候, 就显示出了天资聪慧。
2.(表示方式)以…的身份, 以…资格, 作为; 以…形式, 以作为; 以…角色, 扮演…角色; 如同, 像
3.(表示结果)成为, 看作, 看成
We had better treat it as a joke.
我们最好把它当作玩笑。
4.(表示目的)为了, 以…为目的
The dykes were built as a protection against the sea.
建筑堤坝是为了防止海水泛滥。
5.(表示举例)例如, 诸如…之类的
We talked about such subjects as the weather.
我们谈论了诸如天气之类的话题。
连接词 conj.
1.在…期间, 当…时候
I was coming in as he was going out.
我进来的时候, 他正出去。
2.尽管, 即使, 虽然
Intelligent as you are, I suspect you will fail.
尽管你聪明, 我猜想你会失败。
3.像…一样
4.由于, 因为
As you weren't there I left a message.
因为你不在那里, 我留了个信儿。
5.照…方式
6.正如；如同

Answer 3

你知道从属连词as引导的时间状语从句是怎样的吗