请问2个英语题目（关于倒装方面得）
1.Nowhere else is there such perfect silenceas in thesemoutains.
我不明白得是句子里得“is there”,there be 句型本身不就是倒装了吗?这个句子为什么要到装成is there?
2.He believed ,____,that people should start as early as possible to look at the world and nature and to think aboutwhat they saw.
答案： as did his mother.
请问这个句子为什么要倒装?as引导让步状语从句的时候倒装,这里明明没有让步的意思?