Réponse:
1
a) I am having lunch
b) I go back home
c) I do my homework
2
a) Jane isn't having dinner
b) She's watching TV
c) She's sitting on the floor
d) She isn't reading a book
e) She's not playing the piano
f) She's laughing
g) She's wearing a hat
h) She's not writing a letter
Explications:
's = is
's not = isn't
