Circle the correct form of the verb.
1. we did not(know/knew)what to do.
2.The Russian visitors didn't (understood/untrstand)French .
3. We didn't (catch/caught) the baii.
4. The car didn't (started / start ) this morning.
5. The salesmen didn't (forgave/forgive) the thieves.
6. Recher didn't (felt / feel)well yesterday so she (leavers/ left)shool early.
7. She didn't 9choose/chose)the red sweater.