Sentence 1: A new constitution consolidating liberal reforms was drawn up, and approved by a referendum held in 1961.

Sentence 2: The referendum had a great voter turnout.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: According to BLM officials, BLM is planning to revise the performance elements in its senior executive performance plans for the 2002 performance appraisal cycle to reflect the priorities of BLM and the Department of the Interior.

Sentence 2: According to BLM officials, BLM is not planning to revise the performance elements or do anything at all.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: But there was thunder.

Sentence 2: There was no storm, but there was thunder.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell