如果你要问已成为过去的一件事情,就用 "Did":
Did you eat out last night?
Did you see the burglar?
How did you go to school this morning?
What did you do when you saw her?
如果你要还没成为过去,还会发生的事情,就用 "Do":
Do you play badminton?
How often do you visit your grandparents?
Do you like singing?
What do you do?
Where do you live?