（2）引导时间状语从句的连接词除上述外还有：

①till, not … until …, until, before, since

Don’t get off the bus until it has stopped.

He waited for his father until(till)it was twelve o’clock.

It will be five years before he returns from England.

②hardly / scarcely … when, no sooner … than, as soon as once

表示“一……就”

As soon as I have finished it , I’ll give yu a call.

Once you show any fear, he will attack you.

We had hardly got / Hardly had we got into the country when it

began to rain.

No sooner had he arrived / He had no sooner arrived than she started complaining.

③directly, immediately, the moment, the minute that… 一……就

He made for the door directly he heard the knock.

④each time, every time, by the time

Each time he came to my city, he would call on me.

注意：表示未来情况，主句用将来时，从句用现在时。

2、让步状语从句

（1）although与though可以引导让步状语从句，不能与but连用，但可以与yet连用。

Although they are poor,(yet)they are warm-hearted.

（2）even if或even though引导让步状语从句，表示“即使”，“纵然”，用来使人注意下文所强调内容的性质。

I’ll get there even if(though)I have to sell my house to get enough money to go by air.

（3）no matter后接上who、what、where、how等疑问词，也可以在这类疑问词后面加上ever构成whoever、whatever、wherever、however等。

Don’t trust him, no matter what / whatever he says.

Whoever breaks the law will be published.

No matter how hard the work is, you’d better try to do it well.