Question: He sank on to the bed and gave himself up to reflection.
The bed he sank on to was very comfortable.

Answer: it is not possible to tell

Question: half-board may be obligatory during high season.
You are required to half-board when it is busy.

Answer: yes

Question: His opinion of Julius's power of hustling was high.
Julius was self-taught in hustling.

Answer:
it is not possible to tell