Here are the answers for the 3rd person singular forms:
1. to brush — she brushes
2. to go — it goes
3. to say — he says
4. to ride — she rides
5. to carry — it carries
6. to fix — he fixes
7. to research — she researches
8. to dry — it dries
9. to begin — he begins
10. to do — she does
11. to lay — it lays