beableto用法总结
时间：2026-07-30 05:37:25来源：
“Be able to” 是英语中表示“能够”的常用结构，常用于表达能力、可能性或成功完成某事。以下是其常见用法总结：
| 用法 | 结构 | 例句 |
| 一般现在时 | be able to + 动词原形 | I am able to swim. |
| 一般过去时 | was/were able to + 动词原形 | She was able to finish the work. |
| 现在完成时 | have/has been able to + 动词原形 | They have been able to help us. |
| 过去完成时 | had been able to + 动词原形 | He had been able to leave early. |
| 情态动词后 | can/could/be able to + 动词原形 | I could be able to join you. |
与 “can” 相比，“be able to” 更强调通过努力或条件实现的可能性。使用时注意时态和语态的变化。
