状语从句
一
、
时间状语从句
要点
:
时间状语从句，由以下连词引导：
When
，
while
，
as
，
after
，
before
，
as soon as
，
since
，
till /until
，
by the time
在时间状语从句中，要注意时态一致。一般情况下
主句是将来时的时候，从句要用一般现在时
(
主将从现）
。
1.
when
Mozart started writing music when he was four years old.
2.
while
He visited a lot of places while he was traveling.
3.
as
He smiled as he stood up.
as
/
when
/
while
的辨析
as
、
when
、
while
都表示
主、从句动作同时发生
（均为当
......
的时候的意思），三者差异如下：
①
as
表示“一边
,
一边＂的意思
,
强调两个动作同时进行，并表示对比
②
when
1
.
还可以表示从句动词的动作在主句动词的动作＂之前
＂或＂之后＂发生。
2
.
when
＝
and then; at that moment (
正在那个时候
)
③
while
1
.
用于时间较长时（
while
后常跟进行时）
2
.
强调两个动作同时进行，并表示对比时
有时这三个连词可以互换，有时不可以。
When
I had read the article, he called me.
When
I got to the cinema, the film had begun.
She thought I was talking about her daughter,
while
, in fact, I was talking about my daughter.
While
the alien was buying a souvenir, the girl called the police.
Mother was worried because little Alice was ill, especially
as
father was away.
4.
after
He left the classroom
after
he had finished his homework the other day.
5.
before
Mr.
Brown
had worked in a bank for a year
before
he came here.
6.
as
soon as
04 状语从句-备战2023年中考英语核心语法精讲精练（全国通用）.docx
