My brother has a car.(改为否定句)

题目

My brother has a car.(改为否定句)
怎么改
我知道楼下的答案是正确的，但是为什么是 My brother doesn't have a car.
而不能改为 My brother hasn't a car.

答案

My brother doesn't have a car.
因为 在由have作谓语的句子变疑问句或否定句时,在美式英语中,无论何种情况,都要借助于助动词do或does 所以不能改为 My brother hasn't a car.