The structure for questions and short answers in the Present Continuous tense is:
- Am I + verb-ing? Yes, I am. No, I'm not.
- Are you/we/they + verb-ing? Yes, you/we/they are. No, you/we/they aren't.
- Is he/she/it + verb-ing? Yes, he/she/it is. No, he/she/it isn't.