while引导哪三种用法？
一、while
用作名词时，意为“一段时间，一会儿”。例如：
i
stayed
there
for
a
short
while.
（我在那儿呆了一小会儿。）
the
postman
came
a
short
while
ago.
（邮递员刚刚来过。）
二、
while
用作连词时，有以下几种含义：
1.
意为“当……时候，和……同时”，引导时间状语从句。例如：
while
i
was
watching
tv，
the
bell
rang.
（我看电视时，铃响了。）
meimei
watched
tv
while
she
ate
her
supper.
（梅梅边吃晚饭边看电视。）
2.
意为“虽然，尽管”，引导让步状语从句。例如：
while
it
was
late，
he
went
on
working.
（虽然很晚了，但他还在继续工作。）
while
he
is
in
poor
health，
he
works
hard.
（虽然他身体不好，但他还是努力工作。）
3.
连接两个并列句子，表示“对比”关系。例如：
he
went
out
for
a
walk，
while
i
stayed
at
home.
（他出去散步了，而我却呆在家里。）
i
like
singing
while
she
likes
dancing.
（我喜欢唱歌，而她喜欢跳舞。）
you
like
sports，
while
i
prefer
music.
（你喜欢体育，而我更喜欢音乐。）
三、
while
引导状语从句时，应注意以下几点：
1.
while
引导的时间状语从句既可放在句首，也可放在句末；而
while
引导的让步状语从句一般放在句首，不放在句末。另外，也可以从意义上加以区分。例如：
while
he
was
tired，
he
went
on
working.
（虽然他累了，但他还是继续工作。）
（
while
引导让步状语从句）
while
he
was
tired，
he
would
have
a
rest.
（他累了就休息一会儿。）
（
while
引导时间状语从句）
2.
while
引导让步状语从句时，如果从句的主语和主句的主语相同，那么从句的主语和谓语动词
be
都可以省略。例如：
while
he
was
ill，
he
went
there.
（=
while
ill，
he
went
there.）
（虽然他有病，但他还是去那里了。）
3.
while
和
when
都可以引导时间状语从句，但应注意：
while
引导的时间状语从句中的谓语动词必须是延续性的动词；而
when
引导的时间状语从句中的谓语动词既可以是延续性动词，也可以是非延续性动词。当时间状语从句中的谓语动词是延续性动词时，
while
和
when
可以互相替换。例如：
while
we
were
talking，
the
teacher
came
in.
（我们正在谈话时，老师进来了。）
the
bus
had
left
when
we
arrived
at
the
bus
stop.
（当我们到达车站时，公共汽车已经开走了。）
（
arrive
是非延续性动词，因此，此句中的
when
不能用
while
替换。）
when
/
while
we
were
having
a
meeting，
our
teacher
came
in.
（我们正在开会时，老师走了进来。）
（
have
是延续性动词，因此，句中的
when
可以用
while
替换。）
4.
while
引导的状语从句还可以表示“某个动作正在进行的同时，另一个动作也在进行之中”。例如：
while
the
teacher
was
speaking，
the
students
were
listening.
（老师讲课时，学生们在听。）
while
he
was
writing，
i
was
reading.
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