упростите 4a+2b-a-b

1. I can see ... eraser on your ... table, but I can see no ... pencil. 

2. Is this your ... pencil? — No, it isn't my ... pencil, it is ray sister's ... pencil. 

3. I have ... sister. My ... sister is ... engineer. My sister's ... husband is ... doctor. 

4. This ... pen is good, and that ... pen is bad. 

5. Is this ... pencil? — No, it isn't ... pencil, it's ... pen. 

6. I have no ... CD-player. 

7. They have ... dog and two ... parrots. 

8. Give me ... ball, please. 

9. This is ... book. It is my ... book. 

10. I have ... spoon in my ... plate, but I have no ... soup in it.

9. This is ... book. It is my ... book. 

10. I have ... spoon in my ... plate, but I have no ... soup in it.