Sentence 1: What then occasioned this sudden change of sentiment?

Sentence 2: What has caused the sudden change in your opinion?
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: I guess you never know what might turn up." Tommy kept a respectful silence.

Sentence 2: You never know what we might find out there
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Newsweek explains a new musical Rock 'n' rap, a k a hick-hop, in which white performers such as Limp Bizkit and Kid Rock combine hard rock with the violent themes and outlaw imagery of rap.

Sentence 2: Limp Bizkit and Kid Rock are the originators of pop rap.
Is this second sentence entailed by the first?

Answer:
no