英语的介词 as 都有 哪些用法[朗读]

as作连词的用法：
1、作，当的时候，引导时间状语从句。
例句：as a young man,he was active in sports。
2、as等于since，作既然。
例句：as he wasn't ready in time,we went without him。
3、作，虽然、尽管，引导让步状语从句。
例句：tired as they were,they walked on。
as作关系代词的用法：
例句：he is very careful,as his work shows。
as作介词的用法：
as引导的介词短语大多用作状语。
例句：as a league member，i'll take the lead in everything。