1 as... as...的用法: as后接系动词is
Such statements are true to an extent. On one hand, it is true that the volatility of any crop is as sensitive to the weather as is the quality of the air we breathe. Thus, the agricultural industry is only successful in climates where growing conditions are relatively at optimum levels. On the other hand, rental car companies often hope for severe weather locally because of the increase in demand of rental cars that often follow. Nonetheless, the rental car industry is one that does not take as much into consideration the weather conditions of their given location.
参考译文（粗体字）：一方面，任何农作物由于非常容易受到天气变化的影响，其收成随着也有好有坏，就像我们对所呼吸空气的质量非常敏感一样。
请问老师，红色粗体句子的句型结构是什么？as 后面为何有is？
最佳答案 2017-06-24 21:55
On one hand, it is true that the volatility of any crop is as sensitive to the weather as is the quality of the air we breathe.
语序还原后为下面句子
On one hand, it is true that the volatility of any crop is as sensitive to the weather as the quality of the air we breathe is.
(as代替先行词：sensitive to the weather, 并在从句作表语成分）
同意曹老师解答观点
以上句子语法结构分析如下：
状语：on one hand
形式主语：it
系动词：is
表语：true
真正的主语(that主语从句充当）:that the volatility of any crop is as sensitive to the weather as is the quality of the air we breathe.
主语从句语法结构分析如下：
引导主语从句的连词：that
主语从句的主语:the volatility of any crop
主语从句系动词：is
主语从句表语：as sensitive to the weather
主语从句的比较状语从句：as is the quality of the air we breathe.
比较状语从句语法结构分析
引导比较状语从句“关系代词”:as
主语：the quality of the air (that/which we breathe 定语从句）
系动词：is
表语：as
(备注：比较状语从句因从句主语太长而使用倒装结构，正常语序为“as the quality of the air we breathe is . as在从句做表语成分,as代替前面先行词"sensitive to the weather）
（比较状语从句的主语后面带有一个限制性定语从句we breathe)
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其它 1 个回答
On one hand, it is true that the volatility of any crop is as sensitive to the weather as is the quality of the air we breathe.
这句句子简化以后就A is as sensible as is B. As is B为比较状语从句，as在从句中作表语。由于主语较长，系词be就和主语倒装了。这种情况在书面语种是比较常见的。倒装的结果避免了从句头重脚轻。
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