ought to ,应该,客观上的应该,The cake ought to be good—I used the best ingredients.蛋糕应该是好的——我用了最好的配料.
must,必须,不得不 ,也是主观上的.程度比should强多了.we must study hard.
have to ,是客观上的.不得不.Please be quiet.I have to study the book for a test tomorrow.请不要说话了,明天要考试,我得看书.
must have to ought to 表猜测时的区别
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