Sentence 1: But nearly four decades after the Cuban missile crisis, the world continues to wait, wondering whether a lifting of US trade and tourism sanctions or a change in leadership in Cuba will arrive first.

Sentence 2: It has been four decades after the Cuban missile crisis but things have remained the same.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: How do we know when the president had done a good job?

Sentence 2: The president is doing a great job.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: uh well you have to keep uh if you don't keep them clean my friend had gerbils and you could smell it as soon as you walked into their her house

Sentence 2: My friend had a gerbil that you could smell.
Is this second sentence entailed by the first?

Answer:
yes