if引导的虚拟语气的三种时态例句（if句型虚拟语气的用法归纳）

if引导的虚拟语气，包括：

1.与过去事实相反

2.与现在事实相反

3.与将来事实相反

所以有三种时态。例句：

1.If I hadn't forgetten your telephone number, I would have telephoned you.

2.If I were you ,I would not do it.

3.If you were (should be) a doctor, you would save many sick people.