be able to和can的区别

be

able

to

与can区别：

be

able

to

和

can都是能够做某事，意思一样，以下是两者用法区别：

(1)

be

able

to

强调通过努力而获得的能力，而can则强调自身已具有的能力。如：

She

can

sing

the

song

in

English.

她能用英语唱这首歌。

He

will

be

able

to

sing

this

song

in

English

in

a

few

minutes,

too.

几小时之后，他也能用英语唱这首歌。

(2)

be

able

to

强调一种结果，而can只强调一种可能。如：

Luckily,

he

was

able

to

escape

from

the

big

fire

in

the

end.

幸运的是，他终于逃出了大火。

If

he

got

here

a

few

hours

earlier,

I

could

save

him.

要是他早几小时来，我还能救他。

(3)

be

able

to

可以有各种时态；而can只有一般现在和一般过去两种时态。如：

I

could

help

you

last

night,

but

you

didn’t

come.

昨天晚上我能帮你，而你又没来。

Can

you

see

it

there?

你能看见它在那儿吗？

He

is

/

was

/

will

be

able

to

help

you.

他能帮你的忙(from

www.yygrammar.com)。

(4)

can可用于表示可能性，推测，允许等情况，而be

able

to通常不这样用。