Bom dia
a) look! They aren't singing.
B) artem is not playing football.
c) the Baby isn't sleeping now.
d) my friend is not riding a horse.
F) they are not playing basketball.
G) listen. it isn't raining.
H) he is not running very fast.
I) my cousin isn't riding a bike.
Explicação:
aren't e isn't é a forma contraída do is not e are not quanto estão na negativa mas pode usar as duas formas se você quiser.
