What are the rules for using question tags in comparative sentences?

What are the rules for using question tags in comparative sentences?

The rules for using question tags in comparative sentences are as follows:

1. The question tag should be based on the main clause of the sentence, not the comparative clause.
2. If the main clause is positive, the question tag should be negative, and vice versa.
3. If the main clause contains an auxiliary verb, the question tag should be based on that auxiliary verb.
4. If the main clause does not contain an auxiliary verb, the question tag should use the appropriate form of the verb "do."
5. The subject of the main clause should be repeated in the question tag, unless the subject is a pronoun, in which case the appropriate pronoun should be used in the question tag.
6. The question tag should be in the same tense as the main clause.