while做连词怎么区分"虽然"和"当……时候"这两个意思?

while做连词怎么区分"虽然"和"当……时候"这两个意思?
虽然都是作为连词,但是一个是引导让步状语,一个是引导时间状语,在遇到以下两个句子的时候如何区分?
While the disease is in a __i___ state it is almost impossible to determine its existence by __ii___.
i (A) a critical (B) a latent (C) an overt          ii (D)postulate (E) methodology (F) observation
While some argue that imposing tolls on highway uses circumvents the need to raise public taxes for road maintenance,the phenomenal expense of maintaining a vast net work of roads _____ reliance on these general taxes.
(A) avoids (B) diminishes (C) necessitates (D) discourages (E)ameliorates

·
While
作连词
(1)
引导时间状语

1.We

must

strike

while

the

iron

is

hot.
趁热打铁.

2.While

she

was

listening

to

the

radio
,
she

fell

asleep.
她听着收音机睡着了.

(2)
引起让步状语从句,意思是
“
虽然
…
但是
….”
、
“
尽管
…
但是
…”(
多放于句
首
)1.While

he

loves

his

students
,
he

is

very

strict

with

them..
虽然他爱他的学生,可是他对他们很严格.

2.While

these

experiments

are

interesting

and

useful
,
it

is

important

to

remember

that

they

may

not

always

tell

us

much.(BookIIIp125)
虽然这些实验很有趣也有用,
但是很重要的是要记住,
这些实验也可能不会
告诉你很多.

(3)
引起条件状语,意思是
“
只要
”

1.While

there

is

life

there

is

hope.
只要生命存在,就有希望.

2.While

there

is

a

way

there

is

away.
有志者事竟成.

三、
While
作并列连词用,意思为
“
而,然而
”
,表对比.而
but
表转折.注
意用心比较体会
while
与
but
的句中用意

1.Some

people

waste

food

while

others

haven't

enough.
有些人很费粮食,然而有些人却吃不饱.

2.The

son

was

having

a

good

meal

at

home
,
while

the

parents

were

working

in

the

fields.
儿子在家吃好饭而父母却在田里辛勤劳作.

3.I

ought

to

have

helped

her
,
but

I

never

could.
我本该帮她但没能.

4.Honey

is

sweet
,
but

the

bee

stings.
蜂蜜很甜,但蜜蜂有刺蜇人.

四
.while
,
when
,
as
的用法区别

都译为
“
当
…
的时候
”
,
区别为：
when
后的从句谓语动词既可是延续性动词,
也可是短暂性动词,
而且还可作并列连词,
译为
“
这时
”
.
但以下句型一定用
when
,
作并列连词：

句型
A
：
be

about

to

do…when…
正要做
…
这时
(
发生另一事
)
句型
B
：
was/were

doing…when…
正在
…
这时
(
发生另一事
)
句型
C
：
had

don
e…when…
刚要做
…
这时
(
发生另一事
)
1.We

were

about

to

set

out

when

it

began

to

rain.
我们刚要出发天突然下雨了.

2.He

had

hardly

sat

down

when

his

mobile

rang.
他刚一坐下手机就响了.

3.I

was

walking

along

the

bank

of

the

river

when

I

fell

into

it.
我正沿河岸散步突然掉进水里.

while
后的从句谓语动词只能是延续性动词,强调主从句的两个动词同时发
生；
while
也可作并列连词,表示两个动作的对比,译为
“
而
”“
然而
”
.
as
则表示
两个变化中的动作的同时性,译为
“
一边
…
一边
…”
.

1.While

his

mother

was

cooking

in

the

kitchen
,
the

boy

fell

asleep

in

the

chair.
(
在一个延续动作过程中发生另一个动作
)
2.He

hurried

home
,
looking

behind

as

he

went.
他匆匆回家,边走边往后看.

■
巩固练习：
一
.
改错

1.She

is

fat

but

I

am

thin.
2.It

was

raining

while

we

arrived.
3.She

sang

while

he

walked.
4.I

don't

know

them

well
,
while

they

are

my

neighbors.
二
.
选择最佳答案：

1.She

thought

I

was

praising

her

child
,
_____
,
in

fact
,
I

was

scolding

him

for

his

bad

behaviors

at

school.
A.what

B.while

C.so

that

D.therefore
2.I

do

every

single

bit

of

housework

____

my

husband

Bob

just

does

the

dishes

now

and

then.(2004
全国卷
II35)
A.while


B.since


C.when


D.as
3.______

it

is

expected

that

students

come

university

with

the

ability

to

take

a

good

set

of

notes
,
this

is

not

always

the

case.
A.When


B.As


C.For


D.While
4.We

were

swimming

in

the

lake

___

suddenly

the

storm

started.
A.when


B.while


C.until


D.before
5.---You

seem

to

have

had

that

car

for

years.
---Yes
,
it's

in

good

condition
,
but

I

should

sell

it

____

it

still

runs.
A.if


B.before

C.because

D.while
答案：一
1.but
改成
while
.因为
fat
与
thin
形成对比

2.while
改成
when
.因为
arrived
为短暂动词

3.while
改成
as
.表示
“
一边
…
一边
…”

4.While

they

are

my

neighbors
,
I

don't

know

them

well.
主句
和从句颠倒位置.

二
.1.
选
B
.
while
并列连词,表对比,意为,
“
而,但是
”

2.
选
A.while
含有对比之意,意为
“
然而
”
.

3.
选
D.
在此句中
while
表示
“
尽管
”
.

4.
选
A
.
wasdoing·
·
·
when·
·
·
一个固定句式.

5.
选
D.
意思为
“
趁着
···”