“be”是英语中最基本的动词之一，用于表示状态、身份或存在。它在不同语境中有不同的形式，主要包括am, is, are, was, were等。
| 时态 | 人称 | 形式 | 例句 |
| 一般现在时 | I | am | I am a student. |
| He/She/It | is | She is a teacher. | |
| We/You/They | are | They are friends. | |
| 一般过去时 | I/He/She/It | was | I was tired yesterday. |
| We/You/They | were | We were late for the meeting. |
“be”还常用于进行时和被动语态中，如“I am eating”或“The book was written by him”。掌握“be”的不同形式和用法，有助于更准确地表达意思。
