I.
1. Saw
2. Bought
3. Ate
4. Drank
5. Laughed
6. Was
7. Did
8. Jumped
9. Rode
10. Had
II.
1. Was skating
2. Was walking
3. Was riding
4. Was studying
5. Were dancing
6. Was shaving
7. Were baking
9. Was sleeping
III.
1. Was talking
2. Studied
3. Was sleeping
4. Was walking
5. Watched
6. Was paying
7. Cut
8. Was dancing
9. Was raining
10. Rained