6. How do ordinary nouns form their plurals?
7. How do compound nouns form their plurals?
8. What is one very important use of number?
9. What can you say of the use of the verb with collective nouns?
10. What is case?
11. How many cases are there, and what does each indicate?
12. What can you say about the relation of a noun to a preposition?
13. Are prepositions ever omitted, and why?
14. How are the nominative and objective cases distinguished?
15. How is the possessive case formed in the plural?