Lesson 8. 
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* Problem 1.
1. book, books.
2. box, boxes.
3. pencil, pencils.
4. water, water.
5. knife, knives.
6. class, classes.
7. snow, snow.
8. city, cities.

* Problem 2. 
1. pens.
2. desks.
3. apples.
4. cats.
5. homburgers.
6. buses.
7. hats.
8. games.

* Problem 3.
1. camera. : 
	My father has three cameras.
2. pet. : 
	You have many pets.
3. woman. : 
	We aren't wemen.
4. cup. : 
	Eri and I like red cups.
5. Japanese. : 
	We are Japanese.