三、状语从句

　　时间状语从句　when, whenever, while, as, before, after, since, till, once, as soon as,etc.

　　地点状语从句　where, wherever

　　原因状语从句　because, since, as, for, now that, etc.

　　目的状语从句　in order that, so that, that, etc.

　　结果状语从句　so…that, so that, such…that, that, etc.

　　条件状语从句　if, unless, as (so) long as, etc.

　　让步状语从句　though, although, even if, even though, however, whatever, as,etc.

　　比较状语从句　as…as, so…as, than, etc.

　　方式状语从句　as, as if, as though, etc.

　　1 、时间状语从句

　　常用引导词：when, as, while, as soon as, while, before, after, since , till, until

　　特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when

　　No sooner had I arrived home than it began to rain.

　　他们刚一到家就下起雨来了

　　Every time I listen to your advice, I get into trouble.

　　每次我听从他的建议就会惹麻烦。

　　when, while& as 的差别

　　While多表示一段时间内的持续性动作或状态

　　When和as 既表示持续也可以表示瞬间的概念

　　As 可以表示随着…

　　I was about to leave when the telephone rang.

　　While Peter was reading, his wife was cooking.

　　As she got older, she got wiser.

　　the minute, the moment, every time, the instant, the second, instantly, immediately, directly 等词可以直接引导时间状语从句

　　Immediately he arrived, he started describing us what had happened.

　　The moment I saw it, I liked it.

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