“be动词”是英语中最基础的动词之一，常见的有 am, is, are, was, were。它们在句子中起到连接主语和表语的作用，表示状态、身份或特征。
以下是be动词的主要用法总结：
| 时态 | 动词形式 | 例句 |
| 一般现在时 | am/is/are | I am a student. She is happy. They are teachers. |
| 一般过去时 | was/were | I was late. They were tired. |
| 现在进行时 | am/is/are + v-ing | He is reading. We are playing. |
| 过去进行时 | was/were + v-ing | She was cooking. They were waiting. |
be动词的用法灵活，需根据主语的人称和数进行变化，同时结合不同语法结构使用。掌握这些用法有助于提高英语表达的准确性。
