UC知道在线等解。二句英语不懂。进来瞧瞧！能帮则帮。
来源：百度知道 编辑：UC知道 时间：2024/05/13 03:06:13
一。Without your help ,we couldn't have finished the work ahead of time .
Without your help可以替换成If it had not been for your help,……
1.为什么用 had 有什么语法吗？
二。I was ill that day ,otherwise ,I would have taken part in the sports meeting.
2.为什么用would have ?
Without your help可以替换成If it had not been for your help,……
1.为什么用 had 有什么语法吗？
二。I was ill that day ,otherwise ,I would have taken part in the sports meeting.
2.为什么用would have ?
这两句涉及语法均为关于条件句的虚拟语气，
请记住以下规则：① 表示与现在事实相反的情况：从句谓语动词用过去式（be用were），主句用should/would/could/might+动词原形；②表示与过去事实相反的情况：从句用Had+过去分词，主句用Should/would/could/might+have+过去分词；③表示对将来情况的主观推测：从句用should+动词或 did或were to do ，主句用should/would/could/might+动词原形。
记住这三条规则就可以了，你所说两句句子都是与过去事实相反。
1.hadn't been 过去完成时，因为后面couldn't have done是过去式，提前完成工作在过去，而你的帮助是在过去的过去啦
2.would have done
对已完成或过去的事物的猜测
1.这不是语法吧，翻译就是 如果没有，记住这个表达吧
2.would have 是过去将来时，生病在前，参加运动会在后，又都是过去
故用过去将来时
1。 had是have has 的过去式
2.would have 是虚拟语气，如果那天我没病，我就可以参加运动会了。