If you WEAR/ WILL WEAR sandals in the mountain, you HURT/ WILL HURT your feet.
Wear ...... will hurt
If she WILL FEEL/ FEELS sick, she WILL GO/ GOES to the doctor.
Feels... will go
If Brian WON'T CLEAN/ DOESN'T CLEAN his bedroom, he WON'T GO/ DOESN'T GO to the park.
Doesn't clean... won't go