asto和asfor的用法

e.g. I enquired of the clerk as to which documents were needed. 我问办事员都需要哪些文件。
He’s very uncertain as to whether it’s the right job for him. 对于这项工作是否适合于自己。
as to/as for
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as for
(1) 用以转换话题：as for总是出现在句首，用来引出一方或者新的谈话内 容，但与前方内容也有一定的联系，起到补充前文又突出后方的作用， 使之与前文形成对照。译作“而”、“可是”、“至于”较合适。
e.g.
You can have a bed, but as for the children, they have to sleep on the floor. 你可以睡在床上，至于这些孩子，他们只能睡地板了。
As for his performance, I suppose you’ve read the sarcastic reviews!
要说他表演得如何，我想你已读过那些带有讽刺意味的评论 文章了吧！
As for going back, that is out of the question.
至于回去，那是不可能的。
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as to
(1) 表示涉及某点：as to与引出的词语常置于句末，表示“关 于”“至于”, 只涉及实际内容而不涉及讲话人的态度，并且 常用于否定句之中。但为了突出要提及的人或事情时，常将as to置前，以示强调。 as to可用于引出一个与前文有所不同的话题，此时与as for表示 话题转换的意义相似，但比as for更为正式，但一般情况下，as for 更强调话题的转换。
e.g.
As to the matter you brought up, I think it should be settled as speedily as possible． 至于你提出的事项，我认为应当尽快解决。
Sophia made no remark as to Gerald’s lie to her. 对于杰拉尔德对她撒谎的事儿，索非娅只字不提。 As to（doing） that, I haven’t decided yet. 说到（是否做）那件事，我还没定下来呢。
We had a delightful weekend in the country. As for the traffic, we had no difficulty. 在乡下我们度过了一个愉快的周末。至于交通，我们没有遇 到任何困难。
Much pasture land is under water; and as for the grain, most of that has been ruined. 大片草原淹在水里，至于谷物，也大部分被毁。
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(4) 引出做事依据：as to和后面所接的名词一起放于句末，此 时as to的含义是“按照”、“根据”、“依据”，而as for则 无此义，不能这样使用。
e.g.
The shoes are correctly placed on the shelves as to their sizes and colors. 根据大小和颜色的不同，鞋子整齐地摆放在货架上。
e.g.
As to that technical problem, I will deal with it in detail later. 至于那个技术问题，我以后再详细讲。
He has no complaint as to salary. 工薪方面他没意见。
There can be no possible doubt as to their intention. 至于他们的意图，不可能有什么疑问。
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(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，对引出的词语要加上重音和停顿，以示强调，口气上让 人听出带有讽刺意味，译作“某某人嘛……”，“一提 到……”，“至于某某嘛……”
e.g.
As for John, I never want to see again. 至于John，我再也不想见到他了。
As to the question you raised in your last letter, I think that it is unanswerable. 至于你在上封信中提出的那个问题，我认为那是无法回答的。
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(3) 用以引出问题：as to必须位于句中，它前面出现的多是表 达某种活动的动词、名词或形容词，其后接wh-clause或wh-to do，表示“在……的问题上”、“围绕着……的问题”，所 引出的问题有很强的针对性。也有人认为，这里的as to多余， 去之亦通，所以有时不必译出。
The items on the agenda are listed as to the order of importance. 这些项目是按其重要性排列在议事日程上的。
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【注意】 as for后面通常直接名词或动名词，as to后面可接动名词、名 词从句或疑问词+不定式的短语 e.g. He asked my advice as to what to do. We made enquiries as to when the next train would be leaving. I am terribly uncertain as to whether he is the right man for me.
As to your ability to overfulfill the target, I never had the slightest doubt. 关于你有能力超额完成精选指课件标这一点，我从来未有过半点儿怀疑4 。
(2) 用以旧事重提：as to引出的内容都是前文曾提到过的或者 谈话双方都有所了解的，表示“谈及……”，“说到……”之 义。
I have often wondered as to where some of the money vanished. 我经常感到奇怪，一部分钱怎么就突然不见了。
Meditating as to what he should do he returned to his office. 他一边思考着应该做的事情，一边返回办公室。