如题所述
while
一段时间；当……时（和……同时）；却
（1）I”ll
be
back
for
a
while
（2）He
fell
asleep
while
doing
homework.
（3）John
was
dressed
in
brown
while
Mary
was
dressed
in
blue
连词while大致有以下四种用法:
1.引导时间状语从句,意为"当……的时候;和……同时",此时的主从句谓语动作同时发生,从句谓语通常是延续性动词。如:
Mary
watched
TV
while
she
ate
her
supper.玛丽边吃饭边看电视。
While
she
was
listening
to
the
radio,
she
fell
asleep.她听着收音机睡着了。
while引导从句时,如主从句的主语一致,且从句谓语又含有be,则从句主语和be可省略。while后可直接跟现在分词、名词、形容词或介词短语。如:
We
are
teachers
while
(we
are)
serving
as
students.我们边当老师边当学生。
While
(he
was)
yet
a
youth,
he
gained
many
prizes.他年轻时就曾多次获奖。
He
caught
a
cold
while(he
was)
on
vacation.他度假时患了感冒。
2.表示对比或转折,意为"而;然而"。此时,while一般位于句中。如:
Some
people
waste
food
while
others
haven't
enough.有些人浪费粮食,然而有些人却吃不饱。
You
like
sports,
while
I
prefer
music.你喜欢体育,而我更喜欢音乐。
3.表示让步,通常位于句首,意为"尽管;虽然"。如:
While
I
agree
with
your
reasons,
I
can't
allow
it.尽管我同意你的理由,但我不能允许这样做。
While
he
loves
his
students,
he
is
very
strict
with
them.虽然他爱他的学生,可是他对学生们很严格。
While
(he
was)
respected,
he
is
not
liked.他虽受人尊敬,但并不被人喜欢。
4.表示条件,意为"只要",其意思和用法相当于as
long
as。while可位于句首,也可位于句中。如:
You
don't
have
to
worry
while
we
are
here.只要我们在,你就别着急。
There
will
be
life
while
there
is
water
and
air.只要有空气和水,就有生命。
While
there
is
life,
there
is
hope.留得生命在,不怕没希望。
5.意为"同时;也"。如:
While
the
book
is
welcomed
by
schol-
ars,
it
will
make
an
immediate
appeal
to
the
general
readers.这本书受到学者的欢迎,同时也会引起一般读者的兴趣。
6.意为"趁着"。如:
Make
hay
while
the
sun
shines.晒草要趁阳光好。(谚)
Strike
while
the
iron
is
hot.趁热打铁。(谚)
While
the
roses
are
yet
in
bloom,
will
you
come
with
me
to
see
them?趁着玫瑰花还开着,你和我一道去看看好吗
一段时间；当……时（和……同时）；却
（1）I”ll
be
back
for
a
while
（2）He
fell
asleep
while
doing
homework.
（3）John
was
dressed
in
brown
while
Mary
was
dressed
in
blue
连词while大致有以下四种用法:
1.引导时间状语从句,意为"当……的时候;和……同时",此时的主从句谓语动作同时发生,从句谓语通常是延续性动词。如:
Mary
watched
TV
while
she
ate
her
supper.玛丽边吃饭边看电视。
While
she
was
listening
to
the
radio,
she
fell
asleep.她听着收音机睡着了。
while引导从句时,如主从句的主语一致,且从句谓语又含有be,则从句主语和be可省略。while后可直接跟现在分词、名词、形容词或介词短语。如:
We
are
teachers
while
(we
are)
serving
as
students.我们边当老师边当学生。
While
(he
was)
yet
a
youth,
he
gained
many
prizes.他年轻时就曾多次获奖。
He
caught
a
cold
while(he
was)
on
vacation.他度假时患了感冒。
2.表示对比或转折,意为"而;然而"。此时,while一般位于句中。如:
Some
people
waste
food
while
others
haven't
enough.有些人浪费粮食,然而有些人却吃不饱。
You
like
sports,
while
I
prefer
music.你喜欢体育,而我更喜欢音乐。
3.表示让步,通常位于句首,意为"尽管;虽然"。如:
While
I
agree
with
your
reasons,
I
can't
allow
it.尽管我同意你的理由,但我不能允许这样做。
While
he
loves
his
students,
he
is
very
strict
with
them.虽然他爱他的学生,可是他对学生们很严格。
While
(he
was)
respected,
he
is
not
liked.他虽受人尊敬,但并不被人喜欢。
4.表示条件,意为"只要",其意思和用法相当于as
long
as。while可位于句首,也可位于句中。如:
You
don't
have
to
worry
while
we
are
here.只要我们在,你就别着急。
There
will
be
life
while
there
is
water
and
air.只要有空气和水,就有生命。
While
there
is
life,
there
is
hope.留得生命在,不怕没希望。
5.意为"同时;也"。如:
While
the
book
is
welcomed
by
schol-
ars,
it
will
make
an
immediate
appeal
to
the
general
readers.这本书受到学者的欢迎,同时也会引起一般读者的兴趣。
6.意为"趁着"。如:
Make
hay
while
the
sun
shines.晒草要趁阳光好。(谚)
Strike
while
the
iron
is
hot.趁热打铁。(谚)
While
the
roses
are
yet
in
bloom,
will
you
come
with
me
to
see
them?趁着玫瑰花还开着,你和我一道去看看好吗
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第1个回答 2019-12-26
一般有：“当。。。（和when一样的用法）”“而。。。（表转折）”这两个意思
第2个回答 2020-01-18
第3个回答 2020-04-23
while哪是动词啦，笑话。
第4个回答 2009-10-17
1.WHILE循环的执行形式 WHILE 布尔表达式 DO 语句
例如：
k:=10;
WHILE k>0 DO
BEGIN
Writeln (k);
k:=k-1
END;
其中
(1)WHIlE 和DO是PASCAL保留关键字，是WHILE循环语句的组成部分。
(2)保留关键字DO后面的“语法”只能是一条语句，称为“循环体”；如果循环 体中需要包含多个语句则应该如上例所示，采用一条复合语句。
2.WHILE循环的执行功能 当执行到WHILE语句时
(1)求出布尔表达式的值
(2)若布尔表达式的值为真，则执行循环体内的语句；若为“假”，执行步骤4
(3)重复步骤1和2
(4)循环结束，执行循环后面的语句。本回答被提问者采纳
例如：
k:=10;
WHILE k>0 DO
BEGIN
Writeln (k);
k:=k-1
END;
其中
(1)WHIlE 和DO是PASCAL保留关键字，是WHILE循环语句的组成部分。
(2)保留关键字DO后面的“语法”只能是一条语句，称为“循环体”；如果循环 体中需要包含多个语句则应该如上例所示，采用一条复合语句。
2.WHILE循环的执行功能 当执行到WHILE语句时
(1)求出布尔表达式的值
(2)若布尔表达式的值为真，则执行循环体内的语句；若为“假”，执行步骤4
(3)重复步骤1和2
(4)循环结束，执行循环后面的语句。本回答被提问者采纳
