Lesson 4. 
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* Problem 1.
1. I am Kenji. 
2. You  are a doctor. 
3. Are you a teacher ? - No, I am not. 

* Problem 2. 
1. I am Japanese.
2. Are you from Canada ?
3. Are your a baseball fan ?
	- No, I'm not. I'm a soccoer fan.

* Problem 3.
1. I am a high school student.
	I am not a high school student.
	I'm not a high school student.
2. You are Tom's friend.
	You are not Tom's friend.
	You aren't Tom's friend.

* Problem 4.
1. You are a baseball player.
	Are you a baseball player?
	- Yes, I am.
	- No, I'm not.