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
问题描述：
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
答
jian zi sheng ti ku shang zhi ji qu zao
答
不能
be going用现在进行时表示一般将来时,be going out 译为将要出去.
改成go就没有将来时的意思,只表示一般叙述(一般现在时)
must+be+doing/coming/joking.指确定某人将要做某事(断定)
must+do/go/know/have指必须做谋事,有命令的意思