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问题: Ought not to 还是 do not ought to

Ought not to 还是 do not ought to
两种说法哪种可以用?

解答:

ought是情态动词, 它的否定式是: ought not/oughtn't

所以应该是ought not to

正如 should not do sth 而不能说成 not should do sth 一样。