1 一般疑问句：Is he a student?
否定句：He isn't a student.
2 一般疑问句：Are they in China?
否定句：They aren't in China.
3 一般疑问句：Do you have a toy?
否定句：I don't have a toy.
4 一般疑问句：Does my mom have long hair?
否定句：My mom doesn't have long hair.肯定句呢？你给的句子不就是肯定句么。。。