Could you tell me how long I can keep the book?

Could you tell me how long I can keep the book.为什么用I can Could you tell me how long I can keep the book? How long can I keep the library book?为什么不能用could啊? –Could you tell me how long __________ the book?--Three days could you tell me how can i use the computer与could you tell Excuse me,could/ can you tell me how I can get to the hotel? Could you tell me how I can get to the station?(同义句)Could yo Could you tell me how I can get there?(同义句)Could you tell me Could you tell me how I can get there? 英语可不可以这么说：could you tell me how long may Ikeep this book? Could you tell me how i can get to the park?改同义句 Could you tell me how I can get to the zoo的同义句