Sentence 1: If so, then he was extremely fortunate, for he managed to land on the only large, sandy beach for hundreds of miles around.

Sentence 2: If that is so, he is very fortunate.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: but if you go to a fast-food restaurant you're going to spend four fifty and you're going to produce a lot of styrofoam and a lot of plastic so we you know we'll go there instead of you know just going to a fast-food place

Sentence 2: Fast food doesn't produce a lot of styrofoam or plastic and conserves a lot and recycles often.
Is this second sentence entailed by the first?

Answer: no

Sentence 1: This law is rigidly enforced; consequently, motorboats are seldom available for hire to tourists.

Sentence 2: It is difficult to find motorboats that tourists can hire.
Is this second sentence entailed by the first?

Answer:
yes