这句话有什么问题~THIS IS A HAIR~

This is a key to opening this door这句话有问题吗? This is my weekend这句话有语法问题吗 He cut hia hair once a month这句话有什么错 Is this a key?Yes,it"s.这句话有什么错? This is a orange . It's nice.这句话有什么错? She is going to give me a necklace this weekend.这句话有什么错误?（提示 this is a place where used to be many emporers这句话有什么语法错误 这句话有没有问题"I mean...he didn't think this is a good idea until this is a good news这句话有没有错 This is home这句话有没有什么语法错误 This is hair above a man is mouth意思 You also is such 这句话有什么问题吗?