resposta:

3.a) She is not my best friend.

b) They are not very nice.

c) We are not students.

d) I am not 20 years old.

e) He is not a policeman.

f) You are not in the shop.

g) It is not a big cat.

h) Peter and I are not happy.

i) Jane and Susan are not doctors.

j) They are not at school.

4. a) Is

b) Are

c) Am

espero ter ajudado