学员疑问:这句话when后面的从句结构怎么分析?
老师解答:整个句子主干为:The social issue evolves into a social problem;when those…about it是时间状语从句;状语从句结构是and连接的并列句。and前一句话的主干是those are able to persuade enough people that it is (a problem),persuade后面需要接双宾语,其中that it is (a problem)是宾语从句,根据句意理解省略了表语a problem;who consider it a problem是定语从句,修饰those;and后面一句话的主干a consensus develops;among many people是地点状语;that something needs to be done about it是同位语从句,解释说明consensus的具体内容。本句话中的it都是指代the social issue。
点评分析:这句话的难点一是persuade sb, that…。其中that引导的宾语从句,并且结合语境省略了a problem;其次是不明白and并列的什么成分;句子最后的that引导的同位语从句和consensus隔开了,这也是个难点。在理解句意时,还要记得把it指代内容还原。