Sentence 1: Real evidence is usually vague and unsatisfactory.

Sentence 2: People always agree with each other when they give evidence.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: James Fenton in the New York Review of Books says, 'Plath lovers' will never forgive Hughes for having been Plath's lover--a role which in their fantasies they would much better fill.

Sentence 2: James Fenton writes books, but not reviews of books.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: Sometimes I fear I have underestimated the other boy.

Sentence 2: Sometimes I fear that I overestimated that boy.
Is this second sentence entailed by the first?

Answer:
no