語法復(fù)習專題(13)
Unit13 狀語從句
%一、考點聚焦
1、時間狀語從句
(1)as、when、while用法一覽表。
類別 |
作 用 |
例 句 |
as |
as表示“當……的時候”,往往和when/ while通用,但它著重強調(diào)主句與從句的動作或事情同時或幾乎同時發(fā)生。 |
She came up as I was cooking.(同時) The runners started as the gun went off.(幾乎同時) |
when |
(at or during the time that )既可以表示在某一點的時候,又可表示在某一段時間內(nèi),主句與從句的動作或事情可以同時發(fā)生也可以先后發(fā)生。 |
It was raining when we arrived.(指時間點) When we were at school, we went to the library every day.(在一段時間內(nèi)) |
while |
while意思是“當……的時候”或“在某一段時間里”。主句中的動作或事情在從句中的動作或事情的進展過程中發(fā)生,從句中的動詞一般要用延續(xù)性動詞。在when表示a period of time時,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.