一个英语句子a person needs to know who he or she is before being a

一个人需要在能够知道什么能够使他或她高兴/幸福之前,
知道他/她是谁．
a person needs to know （who he or she is ）宾语从句（before being able to know what it is that makes him or her happy）时间状语（what it is that makes him or her happy）时间状语中的宾语从句,而it是形式主语．真正的主语是：that makes him or her happy

一个人需要知道在能知道这是那使他或者她愉快之前，他或者她是谁