反问句“不是……吗” The Rhetorical Question "不是……吗"

“不是……吗”常用来表示提醒或者表达说话人的不理解、不满等。
"不是……吗" is often used to remind someone of something or to show confusion or dissatisfaction.

如果提问的人对某个事实或者情况有比较肯定的估计，为了进一步得到证实，就可以用这种疑问句提问。“是不是”一般用在谓语前面，也可以用在句首或者句尾。
If one raises a question and is somehow certain about a fact or situation, they can use this kind of question to confirm their guess. "是不是" (literally "yes or no") is usually used before the predicate or at the beginning or end of a sentence.