Do these sentences mean exactly the same thing? If yes, why does (a) use the present tense and (b) the past?
(a) IF I WIN the lottery, I WILL buy a big house.
(b) IF I WON the lottery, I WOULD BUY a big house.
Thank you!
Timing is everything.
In the first instance, there is a real possibility of winning the lottery. The speaker has already purchased a lottery ticket and is awaiting the draw.
In the second instance, the speaker is fantasizing about winning the lottery someday.