Lesson 9. 
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* Problem 1.
1. These are dogs.
2. Those are three pens.
3. These are some cookies.
4. These are my bags.

* Problem 2. 
1. Those are my cats.
2. Are these maps? - Yes, they are.
3. Are these your crases? - No, they aren't.
4. Those are not your caps.

* Problem 3.
1. This is a big city. 
	These are big city.
2. That is my friend.
	Those are my friends.
3. This is my cap.
	These are their caps.