Could you please clarify what you mean by "pang abay ng agam"? Perhaps you meant:
* Pang-abay ng panlunan: This refers to adverbs of place.
* Pang-abay ng panahon: This refers to adverbs of time.
* Pang-abay ng paraan: This refers to adverbs of manner.
If you can provide more context or examples of how the term is being used, I might be able to help you understand it better.