If I FEEL / WILL FEEL tired, I go to bed early.
feel
If you PRESS / WILL PRESS that button, a bell rings.
press
If you wear your coat tomorrow, you AREN'T / WON'T BE cold.
won't be
If you WILL COME / COME back next week, David will be here.
come
If it RAINS / WILL RAIN tomorrow, we'll stay home.
rains
If I go to university when I'm older, I 'LL WORK / WORK very hard.
'll work