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主句
短暂性动作
The telephone rang
持续性动作
从句
When
as
I was doing my project
【注】
as
用于引出一个持续性动词
表示
“
在
……
期间
”
时，其谓语通常只
While
能是那些含有动作
(action)
和
发展
(development)
意味的动词，
一般不能是
线点重合
那些
不用于进行时态的动词
(
如
be, seem, love, want, agree, see, know,
have
等
)
，所以下面一句中的
while
不能换为
as
，但可以换成
when
：
A
：
I’m going to
the post office.
B
：
While you’re
there, can you get me some stamps?
持续性动作
I was doing
my project
It was raining hard
I
was
listening
to
the
radio
持续性动作
到从句所指的整个时间
I was
doing my project
Don’t talk
I kept silent
I
always listen to the radio
He didn’t
ask me in
同时发生（或几乎同时发生）
短暂性动作
I thought
of it
The ice cracked
He
jumped
to
his
feet
I
caught
him
a
message
arrived
My mother was cooking
you’re
eating.
he was writing.
I’m driving.
he was reading the message.
同时发生（或几乎同时发生）
短暂性动作
Just ~ you
opened your mouth.
I
stepped
onto
it.
the boss came in.
he
was
leaving
the
building.
Just ~ the two men were
leaving
When
As
点点重合
短暂性动作
the
telephone rang
we arrived
he
came in
持续性动作
While
When
As
点线重合
主句和从句为两个同时进行
的动作或存在的状态，
且强调主句动作或状态延续
线线重合
he kept me standing at the
door
he was reading the
message.
但是，在
hardly [scarcel
y]…when…
句式中，不能将
when
换成
as
。如：
Scarcely had we arrived, when it began
to rain.
我们刚一到就下起雨来了
。
两个正在发展变化的情况，相当于汉语的
“
随着
”
Things are
getting better and better
it became colder
The
room
grew
colder
my
memory
seems
to
get
worse.
time goes on.
it
grew darker
the
fire
burnt
down.
time
goes
by
as
注：若不是引导从句，而是引出一个短语，则用
with
，不用
as
。
如：
?
With
winter
coming
on,
it’s
time
t
o
buy
warm
clothes.
随着冬天到来，该买暖和衣裳了。
?
The
shadows
lengthened
with
the
approach
of
sunset.
随着太阳下落，影子也逐渐伸长。
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