Sentence 1: Horwitz doesn't leave it there.

Sentence 2: He doesn't leave it there.
Is this second sentence entailed by the first?

Answer: yes


Sentence 1: I have heard people speak of Jane Finn, I think.

Sentence 2: Nobody every heard of Jane Finn.
Is this second sentence entailed by the first?

Answer: no


Sentence 1: Yes, yes, I said impatiently. 

Sentence 2: He did not believe me when I said "yes".
Is this second sentence entailed by the first?

Answer:
it is not possible to tell