"We speak Chinese using Engpsh" 的英文表达是 "We speak Chinese in Engpsh."
这种说法在多语言交流的场合中经常出现，因为在国际社会中，英语是一种通用的语言，很多人用它来交流。
例句：
"We speak Chinese in Engpsh during the international conference."
"我们在国际会议上用英语说中文。"
"I speak Chinese in Engpsh with my foreign friends."
"我和外国朋友用英语说中文。"