Mary's backpack is on the sofa.(就on the sofa 提问)

Mary's backpack is on the sofa.(就on the sofa 提问) Kate is Mary's 一Who's backpack is bigger?一Mike's. She is her aunt.变成复数形式Those are my backpack,backpack用不用加s __ __!Is this__backpack? __,My backpack is here. is this jim's backpack? NO,___backpack is blue 填 lucy's backpack is _ _ _ the chair. The black backpack is Tom's 改为同义句. Lucy's backpack is behind the chair.（改为同义句）Lucy's backpack is_____ _____ _____ the chair. Mary's being chose中的Mary's是Mary has 还是Mary is This is Mary's book对Mary's体温 where's my backpack? Where's my backpack? It is my backpack _your backpack Your backpack is where is backpack 问句hi,is（ ）Mary?回答Yes,it's Mary. I think this is Jim‘s backpack.对Jim’s提问应该怎么写? Mary is Tom's girl f-----.