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15
连接词when, while, as的用法区别：
when, while, as这三个连词都可表示“当……的时候”，
使用时应注意：
1) when可表示一个时间点，也可表示一个时间段。如：
When he came in, we were having supper.
When we were having supper, the light suddenly
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6
九 让步状语从句
种 常 用 的 状
although, though, as, even though/even if, while(虽然）, no matter +which/what/when/where/who/how, whichever, wherever, whatever, whoever, whenever, however, whether…or；
3) as则强调主句和从句的动作在同一时间进行;也可表示
及 地点状语从句 where, wherever
其 常 原因状语从句 用
because, since, as, for, now that(既然）, in that（因为）
的 连
条件状语从句
if, unless, as(so) long as, on
接 词
condition that, 要……)等。如：
went out.
2) while则只表示一个时间段。它所引导的时间状语从句
中的时态常用进行时态。如： When/While he was
eating his breakfast, he heard the doorbell ring.
While he was watching TV, the boy fell asleep.
