一、基本含义对比
say：侧重“说的内容”，强调所说的话本身。
speak：侧重“说话的动作或能力”，常用于正式场合或指语言能力。
二、常见用法示例
1. say 的典型结构
say + (that) 从句：She said (that) she was tired.say something to someone：He said goodbye to me.- 不能直接接“人”作宾语（错误：❌ say me）
2. speak 的典型结构
speak to/with someone：I spoke to the manager.speak a language：She speaks French fluently.- 可单独使用：He never speaks in meetings.
三、使用场景差异
say 多用于引用具体话语或表达观点：
- “I love you,” he said.
- What did she say about the plan?
speak 多用于正式发言、语言能力或抽象交流：
- The president will speak at the conference.
- Do you speak Spanish?
四、常见错误提醒
- ❌ I said him hello. → ✅ I said hello to him.
- ❌ She speaks that she is busy. → ✅ She says (that) she is busy.
- ✅ Can I speak to John?（打电话常用）