be动词或系动词 有什么区别

如题所述

第1个回答  2020-03-30
be 有两种用法;系动词和助动词
系动词的含义是 “是”或者“在.”等,在句中作谓语
He is a student.They are in the room.
助动词没有实在意义,帮忙构成进行时态或者被动语态,不能单独作谓语
He is playing games.The coat was washed yesterday.