Study the following question tags. Special cases.
1) "I am" "aren't I?"
2) "I used to" "didn't I?"
3) Imperative "will/won't you?"
4) "Let's" "shall we?"
5) "Let me/him", etc. "will/won't you?"
6) "I have (got)" "haven't I?" (= possess)
7) "There is/are" "isn't/aren't there?"
8) He never complains, does he?
Examples:
I am tall, aren't I?
He used to drive to work, didn't he?
Please help me, will/won't you?
Let's make a snowman, shall we?
Let him come with us, will you/won't you?
He has got a pen, hasn't he?
He had an accident last week, didn't he?
He has lunch at 1:00 pm, doesn't he?
There's no one here, is there?
There are a few pears left, aren't there?