We were having a meeting when someone broke in.
We were about to set off when it suddenly began to rain.
(6)while作为并列连词,意为“而,却”,表示对比。
He likes pop music,while I am fond of folk music.
◆时间状语从句的核心考点
1.before引导的从句中不用否定式谓语。常用如下句型:
It will be long before...(得过好久才……)
It will not be long before...(过不了多久就……)
It was long before...(过了好久才……)
It was not long before...(过了不久就……)
2.since后面所用动词不同,该动词所表示动作持续时间的计算方法也不同。
It is two years since he joined the army.他参军两年了。
It is two years since he smoked.他戒烟两年了。
3.as,when,while用法一览表。
类别 作用 例句
as as表示“当……的时候”,往往和when/while通用,但它着重强调主句与从句的动作或事情同时或几乎同时发生。 She came up as I was cooking.(同时)
The runners started as the gun went off.(几乎同时)
when (at or during the time that )既可以表示在某一点的时候,又可表示在某一段时间内,主句与从句的动作或事情可以同时发生也可以先后发生。 It was raining when we arrived.(指时间点)
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