Преобразовать в косвенеую речь.
1) Nick said I have never been to London.I think I shall go there next year
2)he said they are leaving next Monday
3)the clerk said to them you can leave the key with he maid upstairs

Nick said he had never been to London. He thought he should go there the  following yearHe said that they were leaving the following MondayThe clerk said to them that they could leave the key with the maid upstairs