3. ______ they ______ (watch) a movie right now? - Yes, ______.

Explanation:

The phrase 'right now' indicates an action happening at the present moment, so the present continuous tense is needed. The sentence is a question, and the answer confirms the action.

Solution:

For questions in the present continuous, the auxiliary verb 'to be' comes before the subject, followed by the main verb in its -ing form. The affirmative answer uses the same structure.

1. Question: Subject 'they' requires 'are'. Verb 'watch' becomes 'watching'.
2. Answer: Subject 'they' requires 'are'.

Answer: Are, watching, are