ought是情态动词。
ought没有其他形式,可用于现在时以及将来时。用于过去时则位于动词过去式之后或不定式的完成式之前:
I ought to write to him today/tomorrow.
我今天/明天应该给他写封信。
I knew I ought to write to him.
我那时知道我应该给他写封信。
She said I ought to write.
她说我应该写。
I know/knew that I ought to have written.
我知道/那时知道我该写的。
否定式:ought not/oughtnt
疑问式:ought I?等
否定疑问式:ought I not?/oughtnt I?等
ought与带to的不定式连用。为了提醒学生这一点,常称之为ought to。
问句或话语中用ought to的时候,可以用 should来回答;用should的问句或话语也可以用ought to回答:
You ought to put in central heating.
Yes,I suppose I should.
你应该装上暖气。
是的,我应该装。
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