I'm a little confused by "would" in this sentence. Speaker A is asking a question, the B's response uses "would". In this sentence, is "would" a past form of "will?"
A: What is the difference between these two sentences?
- If I win this race, I will buy a big house.
- If I won this race, I would buy a big house.
B: Both sentences could only be said before the race. As to the difference in meaning, my answer (like everyone else's, in this case) would be that in the first sentence the speaker speaks as though he believes that it is possible that he will win the race; in the second, he speaks as though he believes that he will not win the race.