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学员疑问：老师，下面这个句子结构太复杂了，请帮忙分析一下。
There is much cause, therefore, to fear lest a thoughtless and lavish dissipation of the noblest mental endowments should become prevalent, or a false and baseless credit-system in thought spring up amid an absolute deficiency of a solid and permanent capital safely invested in fundamental ideas and lasting truths.
老师解答：这个句子的确结构复杂，具体包含了三个句子结构，
主句：There is much cause to fear lest（由lest引导从句）
从句由or连接的两个并列分句：a...dissipation ... should become prevalent,
or a ... credit-system ...（省略should）spring up (amid ...deficiency of... capital...)
点评分析：此句解构的难点有：lest引导从句（虚拟语气），第二个从句中省略should。无论如何，只要是句子，不管是主句还是从句，都应该属于基本句型的某一种。
