Question

when与while的区别

when与while用法的区别是什么？

Answer 1

When和While的区别

①when是at or during the time that, 既指时间点，也可指一段时间，while是during the time that，只指一段时间，因此when引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词，而while从句中的动词必须是延续性动词。

②when 说明从句的动作和主句的动作可以是同时，也可以是先后发生；while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。

③由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；如果从句和主句的动作同时发生，两句都用过去进行时的时候，多用while引导，如：

a. When the teacher came in, we were talking.

当此句改变主从句的位置时，则为：

While we were talking, the teacher came in.

b. They were singing while we were dancing.

④when和while 还可作并列连词。when表示“在那时”；while表示“而，却”，表对照关系。如：

a. The children were running to move the bag of rice when they heard the sound of a motor bike.

孩子们正要跑过去搬开那袋米，这时他们听到了摩托车的声音。

b. He is strong while his brother is weak.

他长得很结实，而他弟弟却很瘦弱。

Answer 2

when和while的区别
①when是at
or
during
the
time
that,
既指时间点，也可指一段时间；
while是during
the
time
that，只指一段时间，因此when引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词，而while从句中的动词必须是延续性动词。
②when
说明从句的动作和主句的动作可以是同时，也可以是先后发生；while
则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。
③由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时；如果从句和主句的动作同时发生，两句都用过去进行时的时候，多用while引导，如：
a.
When
the
teacher
came
in,
we
were
talking.
当此句改变主从句的位置时，则为：
While
we
were
talking,
the
teacher
came
in.
b.
They
were
singing
while
we
were
dancing.
④when和while
还可作并列连词。when表示“在那时”；while表示“而，却”，表对照关系。如：
a.
The
children
were
running
to
move
the
bag
of
rice
when
they
heard
the
sound
of
a
motor
bike.
孩子们正要跑过去搬开那袋米，这时他们听到了摩托车的声音。
b.
He
is
strong
while
his
brother
is
weak.
他长得很结实，而他弟弟却很瘦弱。
具体你可以参考这一段。
when，while，as引导时间状语从句的区别
when，while，as显然都可以引导时间状语从句，但用法区别非常大。
一、when可以和延续性动词连用，也可以和短暂性动词连用；而while和as只能和延续性动词连用。
①
Why
do
you
want
a
new
job
when
youve
got
such
a
good
one
already？（get为短暂性动词）你已经找到如此好的工作，为何还想再找新的？
②Sorry，I
was
out
when
you
called
me．（call为短暂性动词）对不起，你打电话时我刚好外出了。
③Strike
while
the
iron
is
hot．（is为延续性动词，表示一种持续的状态）趁热打铁。
④
The
students
took
notes
as
they
listened．（listen为延续性动词）学生们边听课边做笔记。

Answer 3

两者都有“当---的时候”的意思
但也有区别：
when一般只在某个时间点。如：I was about to leave my house when someone knocked the door.
while 常指在某个时间段，一般与进行连用．如：It was raining hard while we were watching TV at home.
另外，while还有”然而”的意思，而when没有．

Answer 4

1 when可以指动作一前一后发生（主从复合句中的动词都为瞬间动词），也可以指一个动作
发生在另外一个动作之间（主从复合句的动词一个是瞬间动词一个是延续性动词）。
The train had left when I got to the station.
I met one of my old friends when I was walking in the street yesterday.
而while引导的主从复合句则通常都为延续性的动词，因而常常使用进行时态。
My mother was cooking while my father was watching TV.
One boy is rowing while the other boy in the boat is dangling around his
legs in the cool water of the lake.
一个男孩正在划船，而船里的另一个男孩则把腿悬垂在凉爽的湖水中。

2 when 可以用于 be about to do sth. when ...的固定结构当中
I was just about to call you when you called me.

3 while 可以表示对比关系“然而”
He is short while his brother is tall.
Tom has opened his own business while his classmates are still slogging
away at school.
当汤姆的同学还在学校苦读时，他已经开始了自己的事业。

4 while还可以引导让步状语从句“尽管”
While everyone else wouldn't go to the mountain area, he went without a
second thought.

Answer 5

①when意为\"在……时;当……时\",可表示\"点时间\"或\"段时间\",从句谓语可以是终止性动词,也可以是延续性动词。例如:
When I got home, he was having supper.
③while只可表示\"段时间\",从句谓语只限于延续性动词。例如:
While I was sleeping, my father came in.
注:从句谓语是持续性动词时,when、while和as可以互换?主?从句谓语都是终止性动词时,when与as可互换?从句谓语表示状态时,通常用while。