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if的用法是什么，当解释为是否时用什么时态

发表时间：2024-08-06 22:17:14 来源：网友投稿

1.(表示条件)如果

,主句用将来时,if从句用现在时表示将来

will

come

you

invite

him.

如果你请他,他会来的.

2.(表示虚拟)假如,要是

1）时态：可以表示过去,现在和将来的情况.它的基本特点是时态退后.

a.同现在事实相反的假设.

句型

：条件从句

主句

一般过去时

should(

would)

+动词原形

they

were

here,they

would

help

you.

b.表示于过去事实相反的假设.

句型：条件从句

主句

过去完成时

should(would)

have+

过去分词

she

had

worked

harder,she

would

have

succeeded.

The

rice

would

not

have

been

burnt

you

had

been

careful.

lawyer

had

been

here

last

Saturday,he

would

have

prevented

from

going.

had

come

yesterday,I

should

would

have

told

him

about

it.

含义：He

did

not

come

yesterday,so

did

not

tell

him

about

it.

had

not

been

ill

and

missed

many

classes,he

would

have

made

greater

progress.

含义：He

was

ill

and

missed

many

lessons,so

did

not

make

greater

progress.

c.表示对将来的假想

句型：条件从句

主句

一般过去时

should+

动词原形

were+

不定式

would

动词原形

should+

动词原形

you

succeeded,everything

would

all

right.

you

should

succeed,everything

would

all

right.

you

were

succeed,everything

would

all

right.

3.是否

whether

连接宾语从句

wonder

she

ill.

不知她是否病了.

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