How long will you be able to come back from you travel

How long will you be a___ how long will be HOW LONG WILL IT BE?HOW LONG DO YOU THINK IT WILL BE?这两句话的语序为什么不一样? How long will you be staying in China这句为什么不是How long will you stay in China? how long were you in japan how long have you been in japan?how long will you be in janpan?分别 I will wait for you,no matter how long it will be! How long will you be in this country.为什么要加Be... ----- will he be back home ,do you know?A How long B How often C How soon D How far 为什么是How long do you think it will be ...do you think 不是插入语吗?原来不是How long will it be. how long will be online是什么意思 How long will you be able to come back from you travel 关于how soon 和how long.Chould you tell us( ------For about two weeks.A.how soon you will be back B.how long you will be thereC.how soon will you be back D.how long you will be away How long will you stay here?和How long will you be staying here?的用法区别?我指除时态之外的区别 HOW long will you stay there how long will you（）there A.go to B.be C.lived How long was it be,since i held you near?How long will it be,till i have you right here?小弟英语不好, Could you tell me_?For about two weeks A.how soon you will be back B.how long you will be there _____will you stay in America?._____will you stay in America?_____ will you start ______ will you be back?为什么用how long ,when,how soon?