how long is he staying here?(变一般过去时)

how long is he staying here?(变一般过去时) How long will you stay here?和How long will you be staying he How long is he staying?He's staying ___ a week.A at B for C -How long are you staying here? -____depends. -How long are you staying here?-____depends. how long will he be staying解释具体的结构 be staying 为什么这么用 -How long are you staying? How long have you been staying here last night.这个句子哪里错了. -How long do you suppose it is ______ he arrived here? How long do you suppose it is _since_ he arrived here? "How long do you suppose it is _____ he arrived here?" -How long do you think it is _____ he arrived here?.