我在牛津字典上看到这个例句： she is tall, as is her mother. 这个as是充当后面一句比较分句的主语吗？但我感觉仿佛作主语有点奇怪， 为何不写成： she is tall, as her mother is.
She is tall, as is her mother. as分句使用倒装语序。
= She is tall, as her mother is. as分句用正常语序。
我刚推荐了比较分句的倒装结构，正好回答你的问题。
http://ask.yygrammar.com/q-39738.html