Sentence 1: For an account of Benidorm's discovery by world tourism and a description of the town's most interesting sights, see page 43.

Sentence 2: It is not possible to find a written description of the town's most interesting sites.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: i guess we won't know unless they never have any babies

Sentence 2: We will not know unless they have babies.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: i think it would too

Sentence 2: I think it'll be a disaster too.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell