We would eat if they were ready.
We will eat if they are ready.
If she gives you the money, will you buy a car?
If she gave you the money, would you buy a car?
I will go to the market if you do the dishes.
I would go to the market if you did the dishes.
If he's happy, he’ll laugh a lot.
If he were happy, he would laugh a lot.
If they wanted to play BINGO, they would tell me.
If they want to play BINGO, they will tell me.