Are you texting a friend now?
Yes, I am. / No, I’m not.
Are you sending an email now?
Yes, I am. / No, I’m not.
Is your friend texting you now?
Yes, he/she is. / No, he/she isn’t.
Are your friends doing their homework now?
Yes, they are. / No, they aren’t.
What are you wearing now?
I’m wearing a T-shirt and jeans.