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perhaps
表示不确定的可能，较正式，常用于书面语。
maybe
口语中最常用的表示可能性的词，语气轻松、模糊。
possibly
表示‘有可能’，强调一种存在的可能性，通常可能性较低。
probably
表示‘很可能’，概率更高，常用于预测。
| Word | 正式程度 | 可能性高低（主观） | 常见使用场合 |
|---|---|---|---|
| perhaps | 正式 | 中等 | 书面语、正式语境 |
| maybe | 非正式 | 中等 | 口语对话 |
| possibly | 较正式 | 偏低 | 说明一种潜在可能 |
| probably | 通用 | 偏高 | 做出合理推测 |
❌ He maybe is late.
✅ He may be late. / Maybe he is late.（maybe 不直接跟动词原形）
❌ Possibly she will come tomorrow, it's sure.
✅ Possibly she will come tomorrow, but it's not certain.（possibly 表示不确定，不应和“sure”连用）
❌ He probably not come today.
✅ He probably won't come today.（助动词+not 放在一起）