i have shorter hair than he does是不是违背了 主语+be+比较级+than的结构?

i have shorter hair than he does是不是违背了 主语+be+比较级+than的结构? my sister has shorter hair than i比较级讲解 this boy______(have)shorter hair than his hair用have的正确形式填空 we both have black hair,_____my hair is shorter than his.A.butB.becauseC.asD.that My hair is shorter than her(改为同义句)I have________ _________ ________she does I am short .I have curly hair. I have shorter hair than she is.这句话对吗?如果错了,应怎么改,请说明为什么，之前一个问题中的答案不要抄，纯属点错 I have short hair,___ she has long hair. call/friends/any/you/today/have 【连词组句】 shorter/your/before/than/is/hair 【连词组句】 My hair is much shorter than (she) I have short hair.改为一般疑问句 I have black hair in a p_______ I have black hair改为否定句 I have to have my hair cut tomorrow对吗 Your friend's hair is much shorter than when you last met.What do you say to her?为什么是：You had your hair cut?不是：You have your hair cut? i have my hair cut,i feel pretty good I'll have my hair cut tomorrow.(同义句转换）I'll_____someone_____ _______my hair tomorrw. I have longer hair than her.I have longer hair than she.I have longer hair than hers.哪个正确啊?错误的为什么错了哒?