If the sentence is positive
Negative example...
is a small question that is attached
to ask for agreement or to ask for things, favours, or new information.
You told him, didn’t you?
Diona doesn't like swim, does she?
Eula is a good dancer, isn't she?
Tag questions
Tag question are used...
the tag is usually positive
If the sentence is negative
Sayu is hiding, isn't it?
the tag is usually negative
Diluc doesn't like Kaeya, does he?
"You didn’t tell him, did you?"
Positive sentence example