You just heard "Ebony and Ivory" by Paul McCartney and Stevie Wonder. This is a song about racial harmony using piano keys. The black keys on the piano are ebony, and the white ones are ivory (from a textbook)
I have questions about the bolded part.
I am curious about which grammatical role "using piano keys" takes.
- an adjectival phrase modifying "a song"
- an adverbial clause which can be changed into "as it uses piano keys"
If the answer 2 is right in Q1, what is the antecedent of "it" in "as it uses piano keys"? "This" in "This is a song"? I assume this because if an adverbial finite clause is reduced into an adverbial nonfinite clause, the adverbial nonfinite clause shares the same subject as the subject in the main clause. Is this right?
Many thanks in advance:)