Tag Question-are questions with two parts.The first part is a statement followed by a question part.This question part is added to the end like a tag
Tag questions can be stated in two ways.If the statement part is affirmative,the question tag is negative.If the statement part is negative,the question tag is affirmative.
A comma separates the two parts of a tag question.
1.You have been a class officer before,haven't you?
2.You aren't willing to be a class officer , are you?