How( )staying?For five days.为什么不填long they will be,而是要填long

How( )staying?For five days.为什么不填long they will be,而是要填long how long (will they be)staying?为什么不是(they will be) They will stay for five days和They will be staying for five d how long will he be staying解释具体的结构 be staying 为什么这么用 How long ___you___(stay)?--I'm staying for three days. how long will you stay there?()four days.填for还是in?表将来不是用in吗 How long will be staying?----I donnot know.___ How long will you be staying in China How long will you stay here?和How long will you be staying he how will the shoes last?为什么填long 1.How ( ) staying?For five days. Our love will be for how long?