1.

What did you use to do in the summer? or
Where did you use to go in the summer?
In the summer we used to go to the mountains.

2.

Did you use to collect shells?
No, we didn't collect shells. We used to build sand castles.

3.

Did you use to go swimming? or
Did you use to swim? 
Yes, we did. We used to go swimming for hours.

4.

What sports did you use to play? or
Did you use to play any sports?
Well, we used to play volleyball and tennis.

Did you use to lose?
No, we didn't. We used to win!!