For the last one couldn't have been: The cat brought home? Like if we choose another sub, pred, obj. is it incorrect?

@mollygerm Thank you. This kids video helped me better understand your comment also Prepositional phrase

It seems a bit hard to identify the subject, predicate, and object. There are certain sentences that I thought were the sub, pred, and obj. but wasn't. For example, sentence 3, I chose: Botanists extract leaves

@JRamirez I was thinking this also