as for
1)用以转换话题：在有前文的情况下as for总是出现在下文的句首,用来引出另外一方或者新的谈话内容,但与前文内容也有一定的联系,起到补充前文又突出后文的作用,使之与前文形成对照,译作“至于”.例如：
①You have a bed；as for him,he'll have to sleep on the floor．
②Much pasture land is underwater；and as for the grain, most of that has been ruined．
2)用以表现态度：as for还可以用来表示讲话人对某人或某物持有“轻蔑”或“冷淡”的态度,甚至有憎恶之感,讲话时要重读引出的词语并在其后稍作停顿,以示强调,口气上带有嘲讽意味,译作汉语的“至于……嘛”.例如：
①As for you,I never want to see you here in my home again．
②As for his songs,I suppose you've read the sarcastic reviews !