1. Here are the past simple and past participle forms of the verbs you mentioned:
- BUY: bought, bought
- FALL: fell, fallen
- FIND: found, found
- LOSE: lost, lost
- MAKE: made, made
- HAVE: had, had
- SEE: saw, seen
2. Let's put the verbs in brackets into the past simple tense:
a. My mom cooked.
b. Did you play on the computer yesterday?
c. We didn't talk to Alice last week, she was sick.
d. Sarah walked to the beach to enjoy the sun.
I hope this helps!