I know that "as to", "on", and "of" are synonymous with "about", but I also know these words are not always interchangeable. I was wondering if there are rules for picking between these prepositions.
- There is still no news as to whether he will leave the company. (all four can be used with no change in meaning)
- I don't know what you are talking about. (only about and of can be used)
- I heard of that from Jim. (only of and about)
- The speaker spoke on the issue of liquidity markets. (all four?)
Thanks for the help.