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?

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? The boy is my brother.The boy stands in front of the house.改成定语从句 The boy losing the key is my son 转换成定语从句The boy who has lost the ksy is my son The boy who lost the key is my son 可不可以转换成这两句定语从句 The boy losing the key is my son 转换成定语从句The boy who has lost the ksy is my son The boy who lost the key is my son 可不可以转换成这两句定语从句 you met the boy here yesterday；he is my brother改为定语从句 the boy with a ball in his hand is my brother改为定语从句 英语定语从句语法（仅指that引导的定语从句）如何判断关系代词that在定语从句中做什么成分?例如：The boy that talked to me just now is my cousin.The man (that) you saw in the library is my teacher.注：我知道tha The boy losing the key yesterday is my son 转换成定语从句 是不是只能够是The boy who lost the key yesterday is my son 这句啊 定语从句的结构The boy who is under the 请把下列句子改为定语从句.The child is my son.The child is crying in front of the shop.The boy is Mike.The boy is walking with Mary.一定要改为定语从句. 变定语从句 The boy is playing football.The boy is Tom.变定语从句 The boy is playing football.The boy is Tom. 英语练习题 合并为定语从句The boy is Mike.The boy is walking with Mary. The boy playing football yesterday is my son 这个句子的定语用了ing形式对吗.为什么 如果改成定语从句应该怎么改 后置定语和定语从句的问题,比如the boy who is in red is my friend.the boy in red is my friend.两句都可以吧?什么情况下关系代词和这个BE动词能省略?省略后这个定语从句也就变成了后置定语?及物动词是 The boy laughed at is my son.转换成以前的定语从句哪一句正确The boy who is laughed at is my son The boy who was laughed at is my son The boy who is being laughed at is my son 介词短语作定语是不是可以变成定语从句?比如The boy in blue is my brother==The boy (who is) in blue is my brotherThe book written by my father is my favorite==The book (which is) written by my father is my favorite这两者有什么 The man hanged is my uncle 怎么改为定语从句 The boy you laughed at is my son.The boy at whom you laughed is my son第二句为什么是错的.定语从句的不是有可以介词调前来的用法吗.