.as 的用法归纳总结:as作为介词时,用法和语义较单一,其含义为“作为”。但是as 作为连词词性时,其用法和功能较多,可以引导各类从句,as 引导原因状语从句、时间状语从句、方式状语从句、让步状语从句和定语从句。as 的用法1、as 做介词,意思是“作为” 例句:French is known as the most beautiful language in the world.法语以世界上最美丽的语言著称。2、as 做连词,引导时间状语从句,意思是“当的时候” 例句:My mother was cooking fish as I arrived home.当我到家的时候,我妈妈正在做鱼。3、as 做连词,引导原因状语从句,意思是“因为” 例句:As rain has fallen, the air is cooler.因为下过雨,所以空气比较凉爽。4、as 做连词,引导让步状语从句,意思是“虽然” 例句:Young as he is, he has been one of t