When was the play going to begin?可以改.

题目

When was the play going to begin?可以改.
When was the play going to begin.这句可以改成 When did the play going to begin吗``一直搞不懂疑问句...
还有,Of courese you can,为什么不能用 could和might)

答案

不能改因为was going to do是过去现在进行式,did是一般式,两个时态不一样,不能混用.
could和might多用于虚拟语气的回答,Of courese you can,表示肯定用一般式就可以了.