You shouldn't have been so rude to him. 你本不应该对他那么粗鲁。 注:“should have + 完成式”虽然可以表猜测,但因为会造成歧义,应少用。 ought to have done 1、“ought to have + 动词的完成式”表示过去应做某事而实际未做,它的否定形式表示本不应该做某事却做...
比较have to和must 1) 两词都是"必须"的意思,have to表示客观的需要,must 表示说话人主观上的看法,既主观上的必要。 My brother was very ill, so I had to call the doctor in the middle of the night.我弟弟病得很厉害,我只得半夜里把医生请来。(客观上需要做这件...
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