八年级上册英语he has shorter hair than sam为什么sam不用所有格?我感觉有点怪啊,

八年级上册英语he has shorter hair than sam为什么sam不用所有格?我感觉有点怪啊,高手回答! He has shorter hair than Sam.(一般疑问句) _______________________ "He has shorter hair than Sam.And he's calmer than Sam . "He has shorter hair than Sam .And he's calmer than Sam."是什么 英语翻译Is that Sam No,that's Tom.he has shorter hair than Sam.a Tom has shorter hair than Sam.(改为同义句) Tom's hair_____shorter he has short hair than sam he has short hair than his Tom's hair is shorter than------ A.Sam and Bill B.Sam and Bi Sam has longer hair than Tom.（改为同义句） Sam's hair ( he has shorter hair than jame has这句话对吗 Peter is shorter than Sam.怎么提问 Tom has longer hair ()Sam?