情态动词有哪些？怎么样来区别呢？

情态动词两要点;动词原形跟后面,说话语气较委婉,can表"能力"may"许可",must"责任"或"义务",否定回答"needn't"换;should"应该",would"愿",have

to

"被迫"表客观.

注释:对must构成的一般疑问句作否定回答只能用needn't.

can的用法

1.

表能力

can

your

sister

skate

/

can

you

sing

/

can

you

dance

2.

表示可能性

can

you

go

with

us

we

can

go

there

by

bus.

3.

表示同意做某事,意为"允许","可以"

you

can

go

now.

can

i

have

a

look

at

your

photos

4.

表推测(主要用于否定句,疑问句)

it

can't

be

jay

zhou.

he

can't

be

thinking

about

something.

must的用法

1.

表示按命令,规定,责任等必须要做的事.

you

must

do

all

the

homework

by

yourself.

you

mustn't

park

your

car

here.

在回答由must引导的一般疑问句时,如果表示肯定,用must;如果表示否定,要用needn't.

-must

i

come

here

tomorrow

-yes,

you

must.

(no,

you

needn't.)

2.

表示肯定的推测,意为"一定会","一定是",多用于肯定句.

it

must

belong

to

karla.

he

must

be

happy.

you

must

be

joking.

must和have

to

的区别是:must表示说话人的主观意愿,而have

to

则表示客观要求,意为"不得不".

you

must

tell

us

what

you

have

seen.

he

had

to

walk

home

because

the

bus

had

left.

need的用法

need除了可用作行为动词外,还可用作情态动词,作为情态动词使用时,多用于疑问句和否定句,后面直接跟动词原形,作为行为动词时,后面跟带to的动词不定式.

他需要现在去看医生吗

does

he

need

to

see

a

doctor

now

need

he

see

a

doctor

now

need作为情态动词,意为"需要",无时态和人称的变化.

they

needn't

hand

in

their

homework

now.

need

i

stay

with

you

(肯定回答为:yes,

you

must.

否定回答用no,

you

needn't.)

may的用法

1.

表示"可以",用以询问或说明可否做某事.

may

i

use

your

pencil

you

may

come

here

tomorrow.

(在回答由may引导的问题时,常以yes,

please或certainly来表示允许或同意,而用please

don't

或no,

you

mustn't来表示不允许和反对.)

2.

用于表推测某事可能发生或某情况可能存在,意为"可能",一般不用于疑问句.

it

may

rain

this

afternoon.

she

may

still

be

in

the

classroom.

注：①只做情态动词：must,can(could),may(might),

②可做情态动词又可做实义动词：need,dare

③可做情态动词又可做助动词：shall(should),will(would)

,ought

to

④具有情态动词特征：have(had,has)

to,used

to

⑤情态动词表猜测

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