I have this problem. If I want to practice asking questions to each word in a sentence, then I will have the same structure in each question, like in these:
I was waiting for my sister.
Who was waiting for their sister? Who was I waiting for? Whose sister was I waiting for?
So, if my initial sentence is "I bought a book about animals.", I can ask "What did you buy? Who bought the book?"
Can we ask "What did you buy a/the book about?" My concern is the sentence structure. Is it possible? And, yes, I know we can ask "What was the book about?", but I don't want to add/change verbs.
In sentences like "I heard a song about love. I read an article about lions." my question would be the same. So is it somehow related to transitive verbs?