新概念2.60课1.we must be at station to meet her为什么要有一个be?2.we are late already..是否等于we are already late?

新概念2.60课
1.we must be at station to meet her为什么要有一个be?
2.we are late already..是否等于we are already late?

must 等情态动词后要接动词原形.already做副词一般放句尾.