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 lost the key yesterday is my son 如果没有了yesterday 是不是可以这样改：The boy who lost the key is my son The boy has lost the key is my son The boy who will the key is my son
The boy who lost the key yesterday is my son 如果没有了yesterday 是不是可以这样改：The boy who lost the key is my son The boy has lost the key is my son The boy who will the key is my son
问题解答：
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