question tag

Từ điển Oxford Advanced Learner 8th

ˈquestion tag [question tag] BrE NAmE (also ˈtag question) noun (grammar)
a phrase such as isn't it? or don't you? that you add to the end of a statement in order to turn it into a question or check that the statement is correct, as in You like mushrooms, don't you?
See also: ↑tag question