1) You can’t believe it, can/can’t you?
2) She hasn’t arrived yet, has/hasn’t she?
3) The problem was too complicated, was/wasn’t it?
4) They are playing tennis, are/aren’t they?
5) The water in the pond is too cold, is/isn’t it?
6) She hasn’t written the letter, has/does she?
7) She doesn’t like taking photos, has/does she?
8) The story has been very interesting, isn’t/hasn’t it?
9) Your pen friend isn’t polite, is/isn’t he?
10) Our cousins won’t go out tomorrow, will/won’t they?