need have done

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/06/07 19:57:58

need have done
need在这里是情态动词对吧情态动词是有时态变化的呀完全可以说成 needed do吧为什么都要和现在完成来构成过去式呢哪位朋友能帮我弄明白这问题吗像这样搭配的不止need 还有许多像must我理解它没有时态变化而那些有过去形式的这样用真是不明白

经过我反复斟酌,觉得以下参考资料靠谱.
希望能帮助你理解,不理解继续追问.
再问：我说的是need 为什么不可以用needed do来代替need have done
再答： need have done其实是我们英语中虚拟语气中的一种，翻译为“本应该做...的”（而实际上却没有做），但是needed do 纯粹只表示过去的动作。这边举两个例子：You need have finished your work by yesterday.你本应该昨天就完完成你的工作的。（实际上昨天没有完成）I needed do lots of housework when i was a child.当我还是一个孩子的时候我就需要做很多家务活了。明白了吗？

need have done need have done 的用法 could have done和need have have something done和need to be done need have done ,must have done ,can/could have done ,should 关于英语ought to have done 与should have done的区别有need have done 用need not have done 造句,请造5句, 情态动词的中文解释must have done和mustn't have doneneed have done和need didn't need to和和need't have done什么区别? 关于英语情态动词would rather have done need not have done各表示什么意义?请造句 need be done need to be done