Sentence 1: no no i haven't heard of that um-hum

Sentence 2: I have heard about it.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: Then it was you, Mary, who destroyed the will? She shook her head, and Poirot shook his also.

Sentence 2: Then you are the one who forged the will, Mary?
Is this second sentence entailed by the first?

Answer: no

Sentence 1: The English were victorious in the Picardy fields of Crec y (1346) and Azincourt (Agincourt, 1415).

Sentence 2: Azincourt and Crecy were both the sites of English victories.
Is this second sentence entailed by the first?

Answer:
yes