1、as to 与 as for 的区别as for (至于，就 方面说)和 as to (至于；关于)这两个复合介词在含义上相当接近，但在用法上差别很多。下面谈它们的这些差别。1as for1)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：You van have a bed；as for him，hell have to sleep on the floorMuch pasture land is underwater；and as for
2、 the grain, most of that has been ruined2)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：As for you，I never want to see you here in my home againAs for his songs，I suppose youve read the sarcastic reviews !2as to1)表示涉及某点：as to 常放于句中，表示“关于方面”、
3、“有关之事”，但为了突出要提及的人或事之时，也可将 as to 置于句首，以示强调。但只涉及内容，而不涉及讲话人的态度。例如：His wife， an old teacher，has n0 complaint as to salaryAs to your ability to overfulfil the target，I never had the slightest doubt2)用以重提旧事：as to 引出的内容都是前文曾经提到过的或者谈话对方都有所了解的，表示“说到” 之义。，例如：As to doing that，I havent decided yetAs to the ques
4、tion you raised in your last letter，I think that it isunanswerable3)用于提出问题：as to 必须位于句中，前面出现的大都是表达某种心理活动的动词，形容词或名词，其后引接出 wh-clause 或 who-to-v 结构，表示 “在的问题上”、“ 就问题来讲”，所引出的问题都有很强的针对性。但有人认为这里的罄 to 显得多余，去之亦通。所以，有时也不必译出。例如：There is some doubt as to whether the proposal is practicableI enquired of the clerk as to which documents were needed4引出做事的依据：as to 还有“按照” 、“根据”的含义，而 as for 则无此义。例如：The shoes are correctly placed on the shelf as to size and colourThe items on the agenda are listed as to order of importance综上所述，as for 和 as to 在确切含义的表达和具体用法上都是有很大差别的，不能将二者混为一谈
