小学英语语法基础：如何表达本来该做某事?

喝绾伪泶锉纠锤米瞿呈拢俊氛荷儆谩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了（用法和should相同）.You ought to have helped him,but you ...x0d相关：◇ 小学英语语法教学的三个原 >>详细◇ 小学阶段“《英语课程标准 >>详细◇ 小学英语课程应遵循的几个 >>详细◇ 兴趣－－小学英语学习的羽 >>详细 should have done “should have + 动词的完成式”表示本应该做而实际上没有做,它的否定形式表示某种行为本不该发生但却发生了.有责备的意味.You should have started earlier,but you didn't.你本应该早点儿出发,但是你没有.You should have washed the wound.你应该已经洗好了伤口.She shouldn't have taken away my dictionary,for I wanted to use it.她本不应该拿走我的词典,因为我要用它.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了（用法和should相同）.You ought to have helped him,but you didn't.你本应该帮助他但你没有.You ought to have studied harder.你本应该更努力学习的.He ought not to have stopped his work halfway.他本不应该做这项工作时半途而废.He oughtn't to have done that.他本来就不该做那件事.2、“ought to have + 动词的完成式”还可以用来表猜测.They ought to have arrived by now.现在他们想必已经到达.