Explicação da Matéria

a) I am sick, aren't I?
b) He sings well, doesn't he?
c) We have new books, don't we?
d) They went to church, didn't they?
e) I am not sick, am I?
f) He doesn't sing well, does he?
g) We don't have new books, do we?
h) They didn't go to church, did they?