Question Tag, How to choose subject of the Question Tag in English Grammar, Basics of Question Tag

Verbs and Their Corresponding Question Tags
Forming question tags is one of the easily comprehensible grammatical components in the English language. However, there are some exceptions. Check out the following table to have a clear idea of the verb and its question tag.
Positive Statement - Negative Tag
Negative Statement - Positive Tag
Subject + Verb
Question Tag + Pronoun
Subject + Verb
Question Tag + Pronoun