Premise:
"Possibly she applied oil to the hinges, for I found that it opened quite noiselessly when I tried it. "
Hypothesis: The hinges did not make any sound at all.

yes

Premise:
"we have Kroger but not a Skaggs"
Hypothesis: We have a Kroger but no Skaggs, though we might get one soon.

it is not possible to tell

Premise:
"They sent me in to wait on Mr. Beresford."
Hypothesis: I had been sent in by them to serve him.
yes