A lot of students stayed in the room after the class,John included.

John included这是独立主格,include 和John 之间是被动的关系,所以用过去分词,意思是John被包括.不能用including John,独立主格结构的主语和前面句子的主语不是同一个,也就是说独立主格必须有主语、而如果你用includ...那怎样修改才能变成including John?那那你那么including John放在students后面做定语。