作业帮英语中假设有几类?形式分别是什么?
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/07/19 01:29:37
英语中假设有几类?形式分别是什么?
英语中常常见到表示假设的句子,那么假设有哪几类,形式是怎么样的呢?
英语中常常见到表示假设的句子,那么假设有哪几类,形式是怎么样的呢?
英语中表示假设的句子主要是虚拟语气,其表示方式有：
1.以if条件从句为虚拟语气标志：
与现在事实相反 从句时态用一般过去时（be用were),主句用过去将来时
例如：If I were you,I would finish homework first.
与过去事实相反 从句用过去完成时,主句用过去将来完成时
例如：If I had gone there,I would have bought two tickets.
与将来事实相反 从句用一般过去时或过去将来时,主句用过去将来时
例如：If he had/would have time,he would come to your birthday party tomorrow.
2.以even if/though让步从句为虚拟语气标志 主从句时态同if条件从句相同
例如：He might give you more help,even though he were/was very busy.
3.以as if/though引导的表语从句或状语从句为虚拟语气标志 主从句时态同if条件从句相同
例如：It seems as if he had known the news.
4.以wish后的宾语从句为虚拟语气标志
与现在事实相反 从句时态用一般过去时（be用were)
例如：I do wish I knew more about the subject.
与过去事实相反 从句用过去完成时
例如：I wish I had seen you yesterday.
与将来事实相反 从句用过去将来时
例如：I wish you wouldn't smoke any more.
1.以if条件从句为虚拟语气标志：
与现在事实相反 从句时态用一般过去时（be用were),主句用过去将来时
例如：If I were you,I would finish homework first.
与过去事实相反 从句用过去完成时,主句用过去将来完成时
例如：If I had gone there,I would have bought two tickets.
与将来事实相反 从句用一般过去时或过去将来时,主句用过去将来时
例如：If he had/would have time,he would come to your birthday party tomorrow.
2.以even if/though让步从句为虚拟语气标志 主从句时态同if条件从句相同
例如：He might give you more help,even though he were/was very busy.
3.以as if/though引导的表语从句或状语从句为虚拟语气标志 主从句时态同if条件从句相同
例如：It seems as if he had known the news.
4.以wish后的宾语从句为虚拟语气标志
与现在事实相反 从句时态用一般过去时（be用were)
例如：I do wish I knew more about the subject.
与过去事实相反 从句用过去完成时
例如：I wish I had seen you yesterday.
与将来事实相反 从句用过去将来时
例如：I wish you wouldn't smoke any more.