Question: Sentence A: And it's not just because time on the bird (the communications satellite) has gotten cheap.

Sentence B: Time on the bird has gotten cheap, but this is not the only reason.

If sentence A is true, how about sentence B?

Answer: yes

Question: Sentence A: uh got you know tomatoes that are starting to bloom and uh i've got carrots i mean yes i've got a few carrots up and i've got some radishes up and as a matter of fact i've already done a second row of radishes and uh the green onions are coming along

Sentence B: This year's crop is doing very poorly because nothing is up yet.

If sentence A is true, how about sentence B?

Answer: no

Question: Sentence A: Scientific literature on the health effects of air pollutants provides the source of these concentration-response functions.

Sentence B: There are many pieces of writing that suggest our air can be a bit better.

If sentence A is true, how about sentence B?

Answer: it is not possible to tell

Question: Sentence A: Instead of engendering hope and optimism, they breed mistrust and cynicism.

Sentence B: They do not give rise to hope but cynicism instead.

If sentence A is true, how about sentence B?

Answer:
yes