must 后面必须加动词
must be 可接形容词 He must be tired
must be 可接形名词He must be a student
也可接动词的过去分词 It must be done quickly
must后面可以加动词吗?或动名词,它的用法是什么
must 后面必须加动词
must be 可接形容词 He must be tired
must be 可接形名词He must be a student
也可接动词的过去分词 It must be done quickly