How long will you be in this country.为什么要加Be...

How long will you be in this country.为什么要加Be... How long will you study in our country?I ____ (plan) to be h how long will you study in our country?i (plan)to be here fo How long will you be staying in China 为什么是How long do you think it will be ... how long will be There will be many Newtons in this country. you will be late 为什么要加BE HOW LONG WILL IT BE? How long was it be,since i held you near?How long will it be How long will you stay here?和How long will you be staying he How( )staying?For five days.为什么不填long they will be,而是要填long