- could、was able to、managed to 都翻成「能」，但只有一个能用在「某一次成功做到」的情境，用错会闹笑话。
- could/couldn't 说过去一段时间内的一般能力，不是某一次。
- was/were able to 说某个特定时刻有能力做到；managed to 说同样情况但强调过程有难度、最终做成了。
- 某次没做到，wasn't able to / couldn't / didn't manage to 三种都能用。
- B1 重点是分清「一般能力」和「某次成功」，说某次成功做到绝不能用 could。
重点内容
could / couldn't — 一般能力（General ability）
表示过去一段时间内都有的能力，不是某一次。
- She could paint before she started school. → 她上学前就会画画了。
- I couldn't cook until I went to university. → 我上大学之前都不会做饭。
- When I lived next to the pool, I could go swimming every day. → 那时候我住在泳池旁边，每天都可以游泳。
was/were able to — 某次成功做到（Specific occasion – successful）
表示某一个特定时刻，有能力做到某件事（强调「有能力」）。
- The burglar was able to get in through the bathroom window.
→ 小偷（那次）能从浴室窗户进去。
managed to — 努力后终于做到（Specific occasion – successful, with difficulty）
表示某件事有难度，但最终成功做到了。
- The burglar managed to get in through the bathroom window even though it was locked.
→ 小偷想尽办法从锁着的浴室窗户爬进去了。
说某次成功做到某件事，不用 could！要用 was able to 或 managed to。
wasn't able to / didn't manage to / couldn't — 某次没做到（Unsuccessful）
表示某一特定时刻没能做到某件事，三种都可以用：
- The speaker wasn't able to attend the conference due to illness. → 演讲者因病无法出席（正式）
- She couldn't watch the match because she was working. → 她在工作，没能看比赛（日常）
- They didn't manage to find a solution. → 他们努力了但还是没找到解决方法（强调困难）
例句练习
| 英文 | 中文 |
|---|---|
| I could speak some French when I was a child. | 我小时候会说一点法语。 |
| He was able to finish the report before the deadline. | 他在截止日前完成了报告。 |
| She managed to find a parking space in the city centre. | 她在市中心找到了停车位（不容易！）。 |
| We couldn't get tickets for the concert. | 我们没能买到演唱会的票。 |
| They didn't manage to reach the summit because of the storm. | 因为暴风雨，他们没能到达山顶。 |
常见错误
❌ I could finish the exam before time yesterday.
✅ I was able to / managed to finish the exam before time yesterday. （说某一次成功做到，要用 was able to 或 managed to，不用 could）
❌ She managed to speak French when she was young.
✅ She could speak French when she was young. （说过去一段时间内的一般能力，用 could，不是 managed to）
❌ He didn't managed to pass the test.
✅ He didn't manage to pass the test. （didn't 后接动词原形 manage，不加 d）
Sources
Blog / Website：