Исправь предложения. к примеру;its a book.-it isnt a book. its an exercise.

Its a book. - It isnt a book.- Its an exercise.
1. Theyre chairs. - They arent chairs. - They are armchairs.
2. Its a blackboard. - It isnt a blackboard. - It is a map.
3. Theyre old. - They arent old. - They are young.
4. Its brown. - It isnt brown. - It is yellow.