Sorry if my question is not suitable for this forum. Although a native speaker, I am unfamiliar with grammatical rules in English (which consequently leads to a lack of comprehension in foreign languages...) I have done research on the differences between direct objects and prepositional phrases but still can't seem to determine the grammatical role of "with my gardening" in the following sentence:
I have been busy with my gardening.
Is it the direct object? A prepositional phrase?
I enjoy learning about grammar.
-- "about grammar" is the direct object...?
To me, a direct object is something received/given that the verb does in the sentence; whereas, a prep phrase constitutes a location, time, etc usually with a preposition (but this is still unclear to me).