“be动词”是英语中最基本的动词之一，用于表示状态、身份或存在。它在不同人称和时态中形式不同，常见用法如下：
| 时态 | 主语 | be动词形式 | 例句 |
| 一般现在时 | I/you/they/we | am/is/are | I am a student. |
| 一般现在时 | he/she/it | is | She is happy. |
| 一般过去时 | I/you/they/we | was/were | We were late. |
| 一般过去时 | he/she/it | was | He was tired. |
| 现在进行时 | I/you/they/we | am/are | They are playing. |
| 现在进行时 | he/she/it | is | She is studying. |
使用时需注意主谓一致，如“he is”而非“he are”。掌握这些用法有助于正确表达句子结构和含义。
