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谁能简洁告诉我虚拟语气的三种时态的主从句的时态结构,还有should什么时候可省略?

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/11/08 15:02:15
谁能简洁告诉我虚拟语气的三种时态的主从句的时态结构,还有should什么时候可省略?
从句 主句
对现在的虚拟 did would /should/could/might do
对过去的虚拟 had done would /should/could/might have done
对将来的虚拟 should do /were to do /did would /should/could/might do