一句话,帮忙看下时态好么If I were a teacher,i would ask my students if they understood the lessons after class要if they understood 还是 if they had understood?

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一句话,帮忙看下时态好么If I were a teacher,i would ask my students if they understood the lessons after class要if they understood 还是 if they had understood?
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一句话,帮忙看下时态好么If I were a teacher,i would ask my students if they understood the lessons after class要if they understood 还是 if they had understood?
一句话,帮忙看下时态好么
If I were a teacher,i would ask my students if they understood the lessons after class
要if they understood 还是 if they had understood?

一句话,帮忙看下时态好么If I were a teacher,i would ask my students if they understood the lessons after class要if they understood 还是 if they had understood?
第一个if是表示虚拟语气；表示现在我的身份并不是一名老师；对现在状态的虚拟需用一般过去式；
第二个if等同于whether ,是否的意思；
后面用if they had understood 表示他们是否已经掌握了的意思

虚拟语气，表示与现在的事实相反。“如果我是一个老师，我会在课后问我的学生他们是否听懂了课上的内容。”但是事实上他不是老师。

第一个if是引导虚拟语气
第二个if是“是否”的意思，我觉得应该接现在完成时而不是过去完成时，if they have understood

if引导条件状语从句，

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