How long could people stay in the space lad?

How long could you waiting for me How long could people stay in the space lad? 请问How long 后面可以接can、could Could you tell us how long we're going to be away?为什么用how long 而不用how soon? How could How could Could you tell me （ — ‘In six days.要填’how soon..‘还是’how often..‘或’how long‘? Could you please tell me how long the flight takes?求这句语法的结构 Could you tell me how long the sports meeting will last?这句话有错误吗? how long will thesports meeting last?could you tell me 合为一句话 how long could I_____your English-chinese dictionary?----only one day,please how long could I ______you english --chinese dictionary?A keep B borrow C.lend D.get Could you tell me how long I can keep the book.为什么用I can 把Could you tell me?How long are we going to be away?改为宾语从句 Could you tell me how long it____to fly to WashingtonA.spendsB.costsC.paysD.takes 英语可不可以这么说：could you tell me how long may Ikeep this book? how long is the river could you tell me 改为宾语从句 could you tell me how long he had been away?哪里错了