As residents of San Francisco have found, a rich city is great for the rich, but it’s hard on everyone whose labor is not valued as highly as engineers.
请问各位老师以下问题：
1. as residents found是方法状语从句吗？
2. 假如变成as residents found it是不是违反空位（gap）的规则？或者说当as引导方法状语从句是不受该规则约束，由于我看其他回答还有as it is know，as we know it，as i understand it.
3. 主句的as…as结构，老师看我以下的句子对吗？
It’s hard on everyone whose labor is not valued as highly as engineers’ labor is.
It’s hard on everyone whose labor is not valued as highly as is engineers’ labor.
It’s hard on everyone whose labor is not valued as highly as engineers’ labor is valued.这个句子应该是错的，假如加上valued就违反了空位（gap）的规则了吧。
第一个问题：这句话是定语从句
第二个问题：这是as引导的两种不一样的从句。as we know it引导的是方法状语从句，假如as we know就是引导的定语从句
第三个问题 It’s hard on everyone whose labor is not valued as highly as engineers’