I'm doing my best to help. The answers would be:
1. By a sculptor - ablative of agent
2. by a patron - ablative of agent
3. By hammer and chisel - ablative of means (denotes the instrument)
4. by millions of people - ablative of means
5. by Bernini - ablative of agent
That's the best I could do. Hope the answers have come to your help.
This text says “Specify the syntactic function and the case of the homonymous pronouns and the following pairs of examples”
You look around the words or look it up,
