as 引导非限定性定语从句能否省略

Things didnt go as we expected.事情并没像大家想象的那样进步下去。这里的as引导是比较状语从句么？

As we expected, the match is hard. 这里的as传统语法觉得是不是是引导的是定语从句。

此外想问下老师在由as引导的非限定性定语从句种，定语从句能否省略？

As reported, most people are suffering from the flu.

1. Things didnt go as we expected.（方法状语从句）

2. As we expected, the match is hard. （传统语法的非限制性定语从句；现代语法的比较状语从句）

3. As reported, most people are suffering from the flu. （传统语法的非限制性定语从句；现代语法的比较状语从句。省略了is）

句 3 演变过程：

As someone reports, （主动）

As is reported,（被动）

As reported（省略）