Question tags.

Question tags are short questions at the end of statements.
They are mainly used in speech when we want to:
confirm that something is true or not, or
to encourage a reply from the person we are speaking to.

Question tags are formed with the auxiliary or modal verb from the statement and the appropriate subject.

A positive statement is followed by a negative question tag.
Jack is from Spain, isn't he?
Mary can speak English, can't she?

A negative statement is followed by a positive question tag.
They aren't funny, are they?
He shouldn't say things like that, should he?