Question-tag grammar questions are easy.
Usually it is:
There are exceptions though.
Be extremely careful when you see questions which use adverbs which have a negative sense such as “never”, “rarely”, “seldom”, “hardly”, “barely” and “scarcely.”
Even though they may be in a positive statement, the feeling of the statement is negative. We treat statements with these words like negative statements, so the question tag is normally positive.
Look at these examples:
He never called you, did he?