1. foot-feet leaf-leaves
2. my feet is under the water.
3. the leaves fall in the autumn season
4. Face -noun Your face is very beautiful
5. Face - you must face the world boldly
6. Direct= he directed me to go to the field.(verb)
7. Ask me  a direct question. direct(adj)
8. plural form erratum-
9. plural form  criterion-
10. mouse- plural mice The cat catches mice.
11. Calf/ - calves The calves are near the cows.
12. datum- plural   
13. medium-  plural
14. potato=potatoes  potatoes do have starch.
15. Curriculum-plural
16. radius- plural
17. formula-plural
18. genius- plural
19. alumnus- plural
20. analysis- plural
21.