These books are 是yours还是your 是Mary ’ book还是Mary ’s

These books are 是yours还是your 是Mary ’ book还是Mary ’s These books are 是yours还是your 是Mary ’ book还是Mary ’ Mary's being chose中的Mary's是Mary has 还是Mary is These rooms are Mary's and Lili's.这种形式正确,还是These rooms are M The book shelf over there is ------填所有格,是Mary's and jane还是Ma Are they your books?还是Are these your books?为什么? “Mary”是名还是姓 I lost a set of keys.然后是用 Is this yours?还是Are these yours? Tom and Mary’s father 这是Mary的父亲,还是Tom和Mar Who is she的答案是She is Mary aunt 还是she's my aunt Mary These exercise -books are ( ).括号是填their还是theirs? 在英语书信中,最后是yours ***还是your's ***?