虚拟语气 should have done 与 could have done

来源：学生作业帮编辑：灵鹊做题网作业帮分类：英语作业时间：2024/05/04 17:53:48

虚拟语气 should have done 与 could have done
Five minutes earlier,we_____the last train
A, could have caught B ought to have caught 为什么选A 为什么不选B 如果有个should have caught 可以选吗为什么

must could should would might
这几个情态动词都可以用来表示对现在或者对过去的推测.
但他们表示的意思是有区别的,一般情况下不可以交换使用.
would 是最普通的陈述语气,如果你是客观的叙述一件事情,就可已选择这个词.
它的使用在条件句中很常见.如,If I hadn’t been ill,I would have finished the work.
must 和might放在一起区分比较容易分辨.
must 表示是的是十分肯定的推测,翻译成“一定”；might表示的是不太确定的预期,翻译成“可能”.
如,He musht have done it last night./He might done it last night.
could have done ,意思是“本来能够”
就是你题目中的这种用法：如果早五分钟,我们本来能够赶上末班车.
should have done,意思是“本应该”
比如你这句话可以延伸成为一个对话：
--Five minutes earlier,we could have caught the last train.
--Yes.We should have hurried up.
如果我们早五分钟,就能赶上末班车了.
是的,我们本应该快点.
这样说不知道你是否明白了.
should have done 和ought to have done差别不是很大,只是语气强弱之分,可以忽略不计.

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