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学员疑问： To classify parenting as a personal choice for which there is no collective responsibility is not merely to ignore the social benefits. 老师，请讲一下for which的用法和第二个is的主语。
老师解答：句子结构是：To classify parenting as a personal choice（主语） for which there is no collective responsibility（定语从句） is（系动词） not merely to ignore the social benefits.（表语）。其中for which there is no collective responsibility是（介词+which）引导定语从句修饰a personal choice，for which =for the personal choice，放到定语从句中理解则是：there is no collective responsibility for the personal choice 。从结构可知，第二个is的主语 To classify parenting as a personal choice
点评分析：首先要了解定语从句的概念，即相当于一个形容词的作用来修饰前面的先行词，而定语从句的引导词通常有三类：a. 关系代词；b.介词+关系代词；c. 关系副词。再者，要明确从句也是一个完整的句子，需要有完整的句子结构，必须符合五大基本句型的某一种。最后，(介词+关系代词)引导定语从句时，需要明确介词的用法或搭配关系。
