Sentence 1: No one knows for certain when the figure was carved; one legend dates it to the early 8th century.

Sentence 2: The figure was actually carved in the 9th century.
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Then you know where she is?

Sentence 2: Then you have been in touch with her?
Is this second sentence entailed by the first?

Answer: it is not possible to tell

Sentence 1: Continuing around the coast in a counter-clockwise direction, Deep Water Bay offers a good beach and harbors.

Sentence 2: Along with its public beach, Deep Water Bay also features many private beaches.
Is this second sentence entailed by the first?

Answer:
it is not possible to tell