13. We ______ (not have) an English class right now.

Explanation:

The phrase 'right now' indicates an action or state that is happening at the present moment. The sentence is negative.

Solution:

The present continuous tense is used to describe actions happening now. The negative form uses 'am not', 'is not', or 'are not' followed by the present participle. For the subject 'We' (first person plural), 'are not' is used.

1. Subject: We
2. Auxiliary verb: are not (aren't)
3. Main verb: have + -ing = having

Answer: are not have