Not less than或Not more than 放句首要到倒装吗

题目

Not less than或Not more than 放句首要到倒装吗
否定词放句首要半倒装 如Not a single person in the party did I know.
那么这个例句Not more less than 500 peple attended the meeting怎么没倒装,为什么?

答案