He fell asleep while/when reading. Strike while the iron is hot。
引导时间状语从句的连接词除上述外还有:
①till, not until , until, before, since
Dont get off the bus until it has stopped。
He waited for his father untilit was twelve oclock。
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 , Ill 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
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,they are warm-hearted。
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