He took off his shoes when he came home

[Kohyoongliat]

He took off his shoes when he came home.

Here I am answering the question when did he take off his shoes. I am not describing the time.

Is “when did he take off his shoes” correct? Or should it be "when he took off his shoes’?

Thanks!

[Torsten]

- When did he take off his shoes?

- He took them off when he came home.

- So, he took off his shoes when he came home?

- Exactly because that’s what you are supposed to do as a good citizen.