Sentence 1: Many people visit the area to take advantage of the water sports; it is particularly popular with canoeists.

Sentence 2: Canoeists avoid this area like the plague, even though the area is known for its water sports.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: He smiled.

Sentence 2: He frowned.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: Adequate supervisory controls also are recommended.

Sentence 2: It is recommended that supervisory controls be put into place.
Is this second sentence entailed by the first?

Answer:
yes