Choose the correct item

1. We
   [have|had] a picnic last weekend.
2. What time did you
   [left|leave] for school this morning?
3. She
   [wrote|write] a letter to her friend yesterday.
4. They
   [didn't go|didn't went] to the theatre last night.
5. I
   [visited|not visited] my grandparents last Saturday.
6. There
   [wasn't|weren't] many shops here thirty years ago.