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是方式状语从句吗？
2. 如果变成as residents found it是否违反空位（gap）的规则？或者说当as引导方式状语从句是不受该规则约束，因为我看其他回答还有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？
(1) It’s hard on everyone whose labor is not valued as highly as engineers’ labor is.
(2) It’s hard on everyone whose labor is not valued as highly as is engineers’ labor.
(3) 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，如果加上valued就违反了空位（gap）的规则了吧。
