当老人夸你用英语时，可能会说：

"Wow, you speak Engpsh very well!"

这句话的来源是来自于老人对你的赞赏，表示你的英语能力很好。

还可以这样说：

"Your Engpsh is really impressive!"

这句话的意思是：你的英语真的令人印象深刻！

其他常用的表扬英语能力的话有：

"You have a great command of Engpsh."

"Your Engpsh is fluent."

"You are a proficient Engpsh speaker."

"Your Engpsh skills are top-notch."

在日常生活中，老人可能会用这些话来表扬你的英语能力。例如：

"You have a great command of Engpsh. How did you learn it?"

"Your Engpsh is fluent. Have you been studying it for a long time?"

"You are a proficient Engpsh speaker. Do you use it often?"

"Your Engpsh skills are top-notch. Do you have any tips for learning it?"