John does his homework (after dinner).对括号里的部分提问I'm going to (visit my grandparents) this afternoon.改为否定句：改为一般疑问句：做肯定回答：做否定回答：对括号里的部分提问：

When does John do his homework?


I‘m not going to visit my grandparents this afternoon.
Are you going to visit your grandparents this afternoon?
Yes,I am
No,I'm not.
What are you going to do this afternoon?

I'm going to (visit my grandparents) this afternoon.
改为否定句：I am not going to visit my grandparents this afternoon.
改为一般疑问句：Are you going to visit your grandparents this afternoon?
做肯定回答：Yes,I am.
做否定回答：No,I am not.
对括号里的部分提问：Where are you going to do this afternoon?
答案：【When does John do his homework?】

翻译；约翰什么时候做他的家庭作业？

解析；从after dinner饭后可以知道要问的是什么时候，所以要when来提问.

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When does John do his homework I'm going to (visit my grandparents) this afternoon.改为否定句：I'm not going to visit my grandparents this afternoon.改为一般疑问句：Are you going to visi your grandpar...