3. It is possible that Nick is on holiday, isn't he? * 4. Could I ask you a few questions, couldn't I? * 5. I don't think that Dan is good at Physics, is he? * 6. It is forbidden to pick flowers in the rose garden, is it? * 7. It is possible that he doesn't always tell the truth, does he? * 8. Perhaps, you are right, aren't you? * 9. Could I wait for the headmaster here, couldn't I? * 10. You mustn't come into this laboratory, must you? * 11. I don't think that she is keen on knitting, is she? * 12. Could I use this phone, couldn't I?