語法復(fù)習(xí)專題(13)
Unit13 狀語從句
%一、考點(diǎn)聚焦
1、時(shí)間狀語從句
(1)as、when、while用法一覽表。
類別 |
作 用 |
例 句 |
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。 |
Please don’t talk so loud while others are working. He fell asleep while/when reading. Strike while the iron is hot.(用as或when不可,這里的while意思是“趁……”) |
(2)引導(dǎo)時(shí)間狀語從句的連接詞除上述外還有:
①till, not … until …, until, before, since
Don’t get off the bus until it has stopped.