must be后面可以加动词吗
问题描述：
must be后面可以加动词吗
答
must be 后面可接名词,形容词,介词短语；如果接动词,动词必须采用ing形式或过去分词.如：He must be a student.（接名词）He must be from America.（接介词短语）She must be watching TV at home.（接动词ing形式...