1. Are you sending an email? Yes, I **am**.
2. Is he doing his homework? Yes, he **is**.
3. Is she listening to music? No, she **isn't**.
4. Are you having lunch? Yes, we **are**.
5. Are they wearing hats? No, they **aren't**.
6. Am I dreaming? No, you **aren't**.
**Explanation:**
This exercise involves completing short answers to yes/no questions using the correct form of the verb "to be" (am, is, are) and the appropriate pronoun.
* The short answer includes 'Yes' or 'No', the subject pronoun, and the appropriate form of "to be", (am, is, are) or its negative form (isn't, aren't).
* The pronoun must match the subject of the question. For example, if the question is about 'you', the answer uses 'I' or 'we'.