你叔叔多大用英文怎么说

你叔叔多大用英语可以说成"How old is your uncle?" 或者 "What is your uncle's age?"。这两句话的来源是英语中询问年龄的常见句式。例如：

"How old is your uncle?" (你叔叔多大了？)
"I'm not sure, but I think he's in his late 40s." (我不太确定，但我想他差不多40多岁了。)

希望这对你有帮助。