Sentence 1: when's the best time to go down there for the water

Sentence 2: When's the best time to go for the water?
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: LSC has helped millions of low-income citizens solve important, sometimes life-threatening, civil legal problems.

Sentence 2: LSC only helped the rich and powerful
Is this second sentence entailed by the first?

Answer: no

Sentence 1: Commerce has always been an effective bridge of cultural barriers.

Sentence 2: A good way to overcome cultural differences has always been the trade of goods.
Is this second sentence entailed by the first?

Answer:
yes