Добрый денек. Помогите сделать задание.

1.We are not making a house .
2.He is not riding a bike .
3.I am not singing a song .
4.It is not closing the box .
5.They are not dancing.
6.I am not playing tennis.
7.She is not skating.
8.You are not looking at it .
9.The boy is not skiing.
10.The boys are not skiing .