The boy()is standing there is my brother他是我的哥哥,为什么不用所属whose?

the boy is standing behindthe door The boy is standing behind the girl改为同义句 The boy is my brother.The boy is standing at the door.合并:The boy who is standing at the door isThe boy is my brother.The boy is standing at the door.合并:The boy who is standing at the door is my brother.省略：The boy standing at the door is There is a boy ( )at the door.A.stand B.standing C.stood D.is standing The boy standing there is my friend的同义句 The boy standing there is a classmate of mine.boy后面为什么不加is? The boy who is standing at the door is my brother.who is 可以省略吗 ( )is the boy who is standing there?My b( )is the boy who is standing there?My brother.请问这个空格填什么? The boy who is standing there is tom中who作主语是不是? The boy()is standing there is my brother他是我的哥哥,为什么不用所属whose? The boy ___ is standing there is my brother.为什么答案选WHO 不用THAT The boy is standing on the man`s shoulders.（改为一般疑问句） The boy is standing in the garden which in front of a tree的原序 The boy is standing on the man's shoulders.改为一般疑问句,并否定回答 Look!The little boy is standing （close） to his mother.为什么用close? the little boy is standing __(close)to his mother是close还是closely? there is a boy standing on the tree 可以改成there is a boy to stand on the tree 那么如果改成there is a boy to be standing on the tree可以吗 定语从句判断The boy is my brother who is standing at the door.The boy who is standing at the door is my brother.这两句都是正确的吗?第二句式定语从句吗?如果不对错在哪里?