Sentence 1: Eleven years ago President George H. W. Bush signed into law the most far reaching amendments to the Clean Air Act since its enactment in 1970.

Sentence 2: The Clean Air Act is amended on a regular basis.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: The other horses were as frightened as the rest of them.

Sentence 2: A loud sound frightened the horses.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: We stopped again in Louisian, under the Oil Fields.

Sentence 2: We had many stops and one of them was the oil fields.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell