1.主谓结构,有谓语动词“be”,表示什么人或物是什么,如:she is a teacher. 2.系表结构时,表示某人或某物怎么样,如:she is very happy. 3.现在正在进行时,如:she is swimming in the river. 4.被动语态,如:the glass is/was broken.
1.主谓结构,有谓语动词“be”,表示什么人或物是什么,如:she is a teacher. 2.系表结构时,表示某人或某物怎么样,如:she is very happy. 3.现在正在进行时,如:she is swimming in the river. 4.被动语态,如:the glass is/was broken. 回答者: catherine5218 ...