英語(yǔ)高考復(fù)習(xí)講與練 英語(yǔ)高考復(fù)習(xí)講與練

考點(diǎn)聚焦
1、時(shí)間狀語(yǔ)從句
（1）as、when、while用法一覽表。
as: as表示“當(dāng)……的時(shí)候”，往往和when/ while通用，但它著重強(qiáng)調(diào)主句與從句的動(dòng)作或事情同時(shí)或幾乎同時(shí)發(fā)生。
She came up as I was cooking. (同時(shí))
The runners started as the gun went off.(幾乎同時(shí))
when: (at or during the time that )既可以表示在某一點(diǎn)的時(shí)候，又可表示在某一段時(shí)間內(nèi)，主句與從句的動(dòng)作或事情可以同時(shí)發(fā)生也可以先后發(fā)生。
It was raining when we arrived. (指時(shí)間點(diǎn))
When we were at school, we went to the library every day.(在一段時(shí)間內(nèi))
while: while意思是“當(dāng)……的時(shí)候”或“在某一段時(shí)間里”。主句中的動(dòng)作或事情在從句中的動(dòng)作或事情的進(jìn)展過(guò)程中發(fā)生，從句中的動(dòng)詞一般要用延續(xù)性動(dòng)詞。在when表示a period of time時(shí)，兩者可以互換。