- 264.50 KB
- 2021-04-17 发布
第二部分 知识运用天天练
类别
作用
例句
as
as
“
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
)
When we were at school
,
we went to the library every day.(
在一段时间内
)
while
while
“
当
……
的时候
”
或
“
在某一段时间里
”
。主句的动作或事情在从句的动作或事情的进展过程中发生,从句的动词一般要用延续性动词。在
when
表示
a period of time
时,两者可以互换
Please don't talk so loud while others are working.
He fell asleep while/when reading.
Strike while the iron is hot.(
不可用
as
或
when
,这里的
while
意思是
“
趁
……”
)