Sentence 1: How do we begin?

Sentence 2: Shall we begin slowly?
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: yes we have a house with a big backyard for the kids to play in and a pretty good size front yard

Sentence 2: Our house doesn't have a big backyard or even a front yard.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: At their press conference after the Senate verdict, several House prosecutors interrupted their sermons against the polls to point out where the public agreed with them.

Sentence 2: After the Senate verdict, some House prosecutors indicated where the public was on their side.
Is this second sentence entailed by the first?

Answer:
yes