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chat
轻松随意地聊天，通常是非正式的小谈话。
talk
泛指说话，可以正式也可以非正式，常指一个人或两个人交谈。
conversation
较正式的词，指两个或更多人之间有目的或持续时间较长的对话。
| Word | 正式程度 | 参与人数 | 时间长度 |
|---|---|---|---|
| chat | 最随意 | 通常2人之间 | 短，轻松 |
| talk | 中等，既可正式也可非正式 | 1对1或对多人 | 不定 |
| conversation | 较正式 | 2人或多人 | 通常较长 |
❌ We had a nice chat about our vacation plans yesterday night.
✅ We had a nice chat about our vacation plans last night.（表达时间应使用“last night”）
❌ I had a talk with my homework.
✅ I talked about my homework.（talk 应是人之间的动作）
❌ We had a conversation about to the party.
✅ We had a conversation about the party.（about 后不用 to）