What are the rules for subject-verb agreement in question tags?

What are the rules for subject-verb agreement in question tags?

The rules for subject-verb agreement in question tags are as follows:

1. If the main sentence is positive, the question tag is negative. Example: He is coming, isn't he?

2. If the main sentence is negative, the question tag is positive. Example: They don't like it, do they?

3. The auxiliary verb used in the question tag should agree with the subject of the main sentence. Example: She has finished, hasn't she?

4. If the main sentence does not have an auxiliary verb, we use the appropriate form of the verb 'do' in the question tag. Example: You like ice cream, don't you?

5. If the main sentence is in the present simple tense, the question tag uses the auxiliary verb 'do' or 'does' depending on the subject. Example: He plays football, doesn't he?

6. If the main sentence is in the past simple tense, the question tag uses the auxiliary verb 'did'. Example: They went to the party, didn't they?

7. If the main sentence includes a modal verb, the same modal verb is used in the question tag. Example: You can swim, can't you?

These are the general rules for subject-verb agreement in question tags.