What did you do yesterday morning?
Simple Past
What do children do when they go to camp on vacation?
Simple Present
What did you do when you went to the seaside?
Simple Past
What were you doing in the evening when you went to the seaside?
Past Continuous
You are at the seaside now. What are you doing?
Present Continuous
What do you do at the seaside?
Simple Present
What were you doing yesterday evening at 7 pm
Past Continuous
What do you usually do in the morning when it's vacation time?
Simple Present
What were you doing yesterday morning at 10 am?
Past Continous
What did you do yesterday evening?
Simple Past
What do you do in the evening when it's vacation?
Simple Present