Question

when 和while引导的时间状语从句有什么区别？？？

Answer 1

when，while引导时间状语从句的区别如下：
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。
二、when从句的谓语动词可以在主句谓语动作之前、之后或同时发生；while从句的谓语动作必须是和主句谓语动作同时发生。
1．从句动作在主句动作前发生，只用 when。
①When he had finished his homework，he took a short rest．（finished先发生）当他完成作业后，他休息了一会儿。
②When I got to the airport，the guests had left．（got to后发生）当我赶到飞机场时，客人们已经离开了。
2．从句动作和主句动作同时发生，且从句动作为延续性动词时，when，while都可使用。
①When ／While ／As we were dancing，a stranger came in．（dance为延续性动词）当我们跳舞时，一位陌生人走了进来。
②When ／While ／As she was making a phonecall，I was writing a letter．（make为延续性动词）当她在打电话时，我正在写信。
3．在将来时从句中，常用when，且从句须用一般时代替将来时。
①You shall borrow the book when I have finished reading it．在我读完这本书后，你可以借阅。
②When the manager comes here for a visit next week，Ill talk with him about this．下周，经理来这参观时，我会和他谈谈此事。
三、when用于表示“一……就……”的句型中（指过去的事情）。
sb．had hardly（＝scarcely） done sth．when．．．＝Hardly ／ Scarcely had sb．done sth．when．．．
①I had hardly ／scarcely closed my eyes when someone knocked at the door．＝Hardly ／ Scarcely had I closed my eyes when someone knocked at the door．我刚一闭上眼，就有人在敲门了。
②I had hardly ／scarcely entered my room when the telephone rang．＝Hardly ／Scarcely had I entered my room when the telephone rang．我刚一走进房门，电话就响了。

Answer 2

when,
while这三个词都有"当……时候"之意，但用法有所不同，使用时要特别注意。
①when意为"在……时刻或时期"，它可兼指"时间点"与"时间段"，所引导的从句的动词既可以是终止性动词，也可是持续性动词。如：
When
I
got
home,
he
was
having
supper.我到家时，他正在吃饭。
When
I
was
young,
I
liked
dancing.我年轻时喜欢跳舞。
②while只指"时间段"，不指"时间点"，从句的动词只限于持续性动词。如：
While
I
slept,
a
thief
broke
in.在我睡觉时,盗贼闯了进来。
辨析
①when从句与主句动作先后发生时，不能与while互换。如：
When
he
has
finished
his
work,
he
takes
a
short
rest.每当他做完工作后，总要稍稍休息一下。(when
=
after)
When
I
got
to
the
cinema,
the
film
had
already
begun.当我到电影院时，电影已经开始了。(when=before)
②when从句动词为终止性动词时，不能由while替换。如：
When
he
came
yesterday,
we
were
playing
basketball.昨天他来时，我们正在打篮球。
③当从句的谓语是表动作的延续性动词时，when,
while才有可能互相替代。如：
While
/
When
we
were
still
laughing,
the
teacher
came
in.正当我们仍在大声嬉笑时，老师进来了。
④当从句的谓语动词是终止性动词，而且主句的谓语动词也是终止性动词时,when可和as通用，而且用as比用when在时间上更为紧凑，有"正当这时"的含义。如：
He
came
just
as
(or
when)
I
reached
the
door.我刚到门那儿，他就来了。
⑤从句的谓语动词如表示状态时，通常用while。如：
We
must
strike
while
the
iron
is
hot.我们应该趁热打铁。
⑥while和when都可以用作并列连词。
Mike
is
tall
while
his
brother
is
short.迈克的个子很高，然而他弟弟很矮。
Mary
was
on
her
way
home
when
two
big
boys
stopped
her.玛丽正走在回家的路上，这时两个大个子男孩拦住她。

Answer 3

作时间状语时，实际上 when 比 while 的用途更广泛，when 的用处可以包含while，而while不一定能包含when。
而作为并列连词时则各有各的意思，when 、while 不可混用 （和问题无关所以省略不说）。

1. when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。

2. when 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.

Answer 4

while的含义大于when，包含when的所有含义。但是while还可以表示动作的同时性。比如：
I am listening to music while my sister is watching TV。

我在听音乐，而我妹妹在看电视。

追问

在详细点呗

追答

已经很详细了。

Answer 5

while 引导的时间状语往往接能延续的动词，表示能延续的状态，而when引导的时间状语从句接点时间，动作（动词）不能延续