1. you are writing an e-mail.
you aren’t writing an e-mail.
are you writing an e-mail?
yes, you are/no, you aren’t
2. she is riding a horse.
she isn’t riding a horse.
is she riding a horse?
yes, she is/no, she isn’t
3. he is singing a song.
he isn’t singing a song.
is he singing a song?
yes, he is/ no, he isn’t
:)
