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学员疑问：这句话的主干和修饰成分如何区分？
老师解答：句子主干为：people have an advantage；who live in a neighborhood with a superior educational system是定语从句，修饰people；其中with a superior educational system是介词短语作后置定语，修饰neighborhood；that is unavailable…lower quality是定语从句，修饰advantage；该定语从句主干是that is unavailable to those，that指代advantage；residing in poor communities or in rural areas是现在分词短语作后置定语，修饰those；where the schools are likely to be of lower quality是定语从句，修饰poor communities和rural areas。
Likewise, people (who live in a neighborhood with a superior educational system定语从句，修饰people) have an advantage 【that is unavailable to those （residing in poor communities or in rural areas定语修饰those ）（where the schools are likely to be of lower quality定语从句修饰areas）】.
点评分析：首先可以把明显的从句划出来，在找出主干。一般让句子变长的就是定语或者状语，要注意和主干进行区分。
