If you don't overheat the coffee, you don't ruin the flavor.
correct
If you could arrive early tomorrow, we would be able to finish the project quickly.
we WILL be able to
If you've decided not to go to the film with us, we would completely understand.
we WILL completely understand
If he hadn't been taking so many risks, he would have fallen off his bike.
...he WOULDN'T have fallen off his bike.
If it hadn't been for the terrible weather, we might really enjoyed our holidays.
...we might HAVE really enjoyed.
If you booked the flights, we could look for accommodation.
correct
If he's decided against taking the new job, he won't have relocated to a different city.
he WON'T BE RELOCATING to a different city.
There will be no point in asking her any more questions if she's still refusing to talk about it.
THERE'S NO POINT IN ASKING....
If you would book the flights, I'd really appreciate it.
correct
If you help me with the supermarket shop, we can finish in no time!
correct