在英语中，“哪儿没有鸭子”可以用以下两种方式表达：

"Where are the ducks?"

这是一个疑问句，意思是“鸭子在哪里？”

例句：

"I went to the park this morning, but I didn't see any ducks. Do you know where they are?"
"I thought I heard ducks quacking, but when I looked outside, there were no ducks in the pond."
"There are no ducks here."

这是一个否定句，意思是“这里没有鸭子。”

例句：

"I was hoping to feed the ducks at the lake, but there are no ducks here."
"I thought I heard ducks quacking, but when I looked outside, there were no ducks in sight."

这个表达的来源可能是由于鸭子在许多地方都是常见的动物，所以人们常常会用这种方式来询问或表达鸭子的存在或缺失。