when的主.从句的时态用法

when的主、从句的时态用法只有两项:
1、在主从句中,谓语动词为暂短性动词的用一般过去时,为持续性动词的用过去进行时。
2、主过从过。这里,在先的动作为过去完成时,在后的为一般过去时,这个用法相当于before。
when
读音:英
[wen]

[wen]
释义:什么时候,何时,什么情况下,什么场合下。
语法:when的基本意思是“什么时候”。可用作疑问副词,用来询问某事曾发生或将要发生的时间,引导特殊疑问句,还可用作关系副词引导限制性定语从句、非限制性定语从句和表语从句,表示“是…时候的事”。
例句:
I asked him when he'd be back to pick me up.
我问他什么时候回来接我。
扩展资料
when的近义词:while
while
读音:英
[waɪl]

[waɪl]
释义:在…期间,当…的时候,与…同时。
语法:while用作连词时,表示“在…(过程)中,在…期间”。常用来引导时间状语从句,当主句的主语和while所引导的从句的主语一致时,while从句中的主语、谓语往往可以省去。
例句:
They walked on in silence for a while.
他们继续默默无语地走了一会儿。

when用在复合句中作状语从句连词时,用法可以归纳如下:
1、主过从过。其中,在主从句中,谓语动词为暂短性动词的用一般过去时,为持续性动词的用过去进行时。例如:
We
stopped
talking
when
the
teacher
came
into
the
classroom.老师进来时我们停止了说话。
Someone
knocked
at
the
door
when
I
was
cooking.我做饭时有人敲门。
while用法与之类似,但不同的是,while后只加过去进行时。如1句中when不可被while替代,而2句中可以。(在高中及以后的语法中,要求并不这么严格。)
当主从表规律时,全用一般现在时。例如:
The
leaves
turn
green
when
spring
comes.春天到来时树叶变绿。
2、主过从过。这里,在先的动作为过去完成时,在后的为一般过去时,这个用法相当于before。例如:
The
class
had
been
on
for
10
minutes
when
I
got
to
school.当我到校时已经上课10分钟了。
3、主将出现。这里的when相当于as
soon
as,表示一……就……。例如:
I‘ll
tell
him
when
he
comes
back.他一回来我就告诉他。
另外用于宾语从句中作连词,无特别时态要求。

一般是两种
一种是主将从现,比如i
will
visit
you
when
i
am
free.
另一种是主句过去进行时,从句一般过去时,比如i
was
reading
a
book
when
he
came
in.

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