例:
We are all students. (are 是系动词,all students 是名词,we = all students)
She looks beautiful. (looks 是系动词,beautiful 是形容词,she = beautiful)
例:
You beat him yesterday. (beat 是行为动词过去式作谓语,him 是代词宾格形式。him 受到 beat)
We are learning English. (are learning 是行为动词的.进行时作谓语,English 是宾语,English 受到 learn 的作用 —— 学英语)