这是as引导的让步状语从句.意思是,即使老板很有钱,但他几乎不知道怎样写自己的名字.
although、though、as都可以引导让步状语从句,eg.Although he is tall,he is not a good basketball player.
在这个句子中 可以用though替换although,但如果使用as,就得变成倒装语序.Tall as he is,he is not a good basketball player.在倒装的语序中as可以由though替换,但是although不行.