my sister didn't use to have short hair.( 改为同义句) my sister ____ ____ _____ have short hair.

问题描述:

my sister didn't use to have short hair.( 改为同义句) my sister ____ ____ _____ have short hair.
急急急………………………………………………

My sister didn't use to have short hair.( 改为同义)
My sister _isn't_ _used_ _to_ have short hair.
原句的语法有问题.