Premise: He was still staring when Nema came back into the room.

Hypothesis: He was still gazing, when Nema reentered the room.
Answer: yes

Premise: Come on, Tim, I've been using that phrase for a long time.

Hypothesis: Come on, I have trademarked that exact phrase so pay up.
Answer: it is not possible to tell

Premise: is that right my gosh

Hypothesis: I don't believe that at all.
Answer: it is not possible to tell

Premise: other documents in various formats

Hypothesis: All the files are the same format.
Answer: no