Ex. 2
2. is
3. are
4. is
5. am
6. are
Ex. 3
2. it isn't an apple
3. is he a teacher?
4. they are not lions
5. i am a student
6. she is vera
7. is it an elephant?
8. you are not a doctor
Ex.4
2. he is a teacher
3. they are dancers
4. they are dogs
5. we are firefighters
6. they are pupils