9. I ______ (not do) my homework in the morning.

Explanation:

This sentence describes a habitual action or a routine, indicating the use of the present simple tense. It's a negative statement.

Solution:

The negative present simple is formed using 'do not' or 'does not' followed by the base form of the verb. For the subject 'I' (first person singular), 'do not' is used.

1. Subject: I
2. Auxiliary verb: do not (don't)
3. Main verb: do

Answer: do not do