1.Is your mum working?
2.Are you writing in English?
3.Are your classmates studying grammar?
4.Are your friends playing?
5.Are you listening to music?
6.Is your teacher writing?
1.Yes,she is /No,she isn't
2.Yes,I am /No ,I am not
3.Yes,they are /No,they aren't
4Yes,they are/No ,they aren't
5.Yes,I am /No,I am not
6.Yes ,she is /No,she isn't