The boy losing the key yesterday is my son 改换成定语从句是不是只能是
问题描述：
The boy losing the key yesterday is my son 改换成定语从句是不是只能是
The boy who lostthe key yesterday is my son如果没有了yesterday是不是可以这样改：The boy who lostthe keyis my son The boy has lost the keyis my sonThe boy who willthe keyis my son
答
The boy who lost the key yesterday is my son.
The boy who lost the key is my son.