一般来说 as to 和 as for有相同意思， 并可互换，但有一个小小（却重要的）区别：句子可用 as for 开头， 但不可用 as to 开头：As for the tennis game, we'll have to reschedule it.
http://www.360doc.com/content/11/0322/21/718112_103657797.shtml
