To make a statement and ask for confirmation of it is a common practice in conversation in English language.
Ex: It is very hot today, isn’t it?
This bold part in the above sentence followed by a Question mark is known as question tag.
Usage of Question Tag in English Grammer
There are two pattern of putting question tag
Auxiliary+ n’t +subject - If the statement made is positive
Examples:-
Auxiliary + subject - If the statement made in negative
Examples:-
Important: - The subject of a question tag is always a pronoun, it can never be a noun as illustrated by the following given some examples:-