Born to a family of professional musicians, she sings as beautifully as a nightgale.

born in: 表示出生于什么地点。

I was born in Tokyo.

born on: 表示出生日期。

The twins were born on 29 August, 1962.

born into/to:表示出生于怎样的家庭。

Meg was born into a large family.

born to:表示由谁所生。

More children are now born to older women.

网友句中的 Born to a family of professional musician为过去分词短语作原因状语。

as + adj/adv + as 为同级比较结构，“像……一样”

第一个as为副词，意为“同样地”；第二个as一般语法书说是从属连词引导比较状语从句“和……一样的”。其实引导比较从句的as是关系副词或关系代词。与than的情况类似。

Areas once regarded as rural are quickly disappearing into the growing city.

once regarded as rural是过去分词短语作定语修饰areas。

句型regard A as B, see A as B, Consider A as B这样的结构中，as其实是省略了分句成分的从属关联词，省略到后面只剩下了一个词，这个词可以是名词、形容词等。as不是介词，rural是形容词而不是名词。通常这类句型就不再详细分析，粗略的把A看作宾语，把B看作宾语补足语，对as则视而不见，但不能省去。