must be going请问这句话是什么时态的?

must be going请问这句话是什么时态的? 请问must be off ,see 请问这句话是什么意思,以及是一种什么语气. I'm afraid I must be going .这句话为什么用被动语态? when i must be home这句话对吗.课文里是when must i be home. We must be must be这句话意思 Going to school by boat must be a lot more funs than taking a bus这句话哪里错了? I must be going.是动名词,还是现在分词? must be和must的用法the trains must be on time 请问这句话是火车必须准时 还是 火车一定准时的还有 they must be there 是 他们一定在那里 还是 他们必须在那里 这个句话的意思差别很大啊?应该怎么运 We must be too hungry to choose our food请问这句话对么? be going 老是听到这句话! but it's just going to( be far) too expensive to decorate it.问be far用法?but it's just going to (be far) too expensive to decorate it.请问这句话中,is just going to 是代表将来时?那be far是什么用法?为什么要加be far是形容 there is something that must be tell you请问这句话对吗?还是there is something that must be tell to you? I will think it must be John's.这句话对嘛?.整句话是“If I see a CD,I'll think it must be John's.” I think it must be teenagers having fun.这句话的句子结构是怎样的 there must be another way 这句话对吗是翻译成 一定有另一个方法吗? I am afraid I must be going Look:Jack is putting on his hat and coat.He must (be going) out.请问这里的be going能否改成go呢?有什么区别呢?结构must+be+doing/coming/joking等must+do/go/know/have等 The weir box must be edged in one piece.请问各位热心的朋友这句话该怎么翻译.