首先要找到句子的从句,找出关系代词,之后分析
eg:This is the hero [that] (we)
句子中that以后的是从句,从句中we是主语,are proud of是一个动词词组从当谓语,我们骄傲that,that指代hero作宾语.
还有 eg:The aunt who came to see us last week is my father's sister
句子中,Who指代The aunt ,从句是who came to see us ,根据句意是来看我们的姑姑,所以who做主语.