你怎么知道我把聊天记录删了，用英文怎么说

中文是‘聊天记录’，英文是‘聊天历史/chat history'。

How did you know that I deleted the chat history?

How did you know that chat history was deleted by me?

要强调影响（无法恢复）的话，就用过去完成时。

要强调’我‘删的（准备吵架了），就加强’I‘的语气。