Respuesta:
1. is listening
2.isn't walking
3.are sitting
4.isn't playing
5.isn't buying
6 aren't talking
7.are swimming
8is throwing
9. is singing
Explicación:
to be+V Ing
to be+not+Ving
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Respuesta:
1. is listening
2.isn't walking
3.are sitting
4.isn't playing
5.isn't buying
6 aren't talking
7.are swimming
8is throwing
9. is singing
Explicación:
to be+V Ing
to be+not+Ving