ought

不可以省略,只有在否定句及疑问句中才可以省略

1.

Ought

to表示应该。如：

You

ought

to

take

care

of

him.

2.

表示推测。注意与must表示推测时的区别：

He

must

be

at

home

by

now.

（断定他已到家）

He

ought

to

be

home

by

now.

（不十分肯定）

This

is

where

the

oil

must

be.

（比较直率）

This

is

where

the

oil

ought

to

be.

（比较含蓄）

3.

“ought

to

+

have

+

过去分词”表示过去应做某事而实际未做。如：

You

ought

to

have

asked

him

(but

you

didn't).

这时，ought

to和should可以互相换用。

注意：在美国英语中，ought

to用于否定句和疑问句时，to可以省略。如：

Ought

you

smoke

so

much?

You

oughtn't

smoke

so

much.

ought和should的区别：

1.ought语气略强。

2.should较常用。

3.ought在美国英语中用的很少，而should却相当常用。

4.ought属正式用语。

标签：ought