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《Grammar》优质课PPT课件下载
as
when
while
before
since
till/untill
the first time
the last time
by the time
every/each time
名词短语
as soon as
the Adverbial Clauses of time
.连接词when, while的用法区别
1). When/While he was eating his lunch, the doorbell rang.
When I stopped my car, a man came up to me.
2). When you have finished your work, you may have a rest.
小结：从句动作发生在主句动作之前时，只能用 when引导这个从句，而不能用while。
用while, when填空：
① _____________ I was walking down the street, I
noticed a police car in front of the store.
② ____________ John arrived, I was cooking lunch.
When/While
When
总结：相当于and at this / that time。意思为“正在/刚要……这/那时（突然……）”