you (eat)... lots of junk food / you (feel)... sick
If you eat lots of junk food, you will feel sick.
you (not/have)... a flashlight / you (not/see)... in the dark
If you don't have a flashlight, you won't see in the dark.
I (take)... a blanket / I (not/have)... space for my flashlight
If I take a blanket, I won't have space for my flashlight
my backpack (feel)... too heavy / I (get)... very tired
If my backpack feels too heavy, I will get very tired.
I (get)... hungry / I (feel)... cold at night.
If I get hungry, I will feel cold at night.
you (not/take)... a blanket / you (get)... cold at night
If you don't take a blanket, you will get cold at night.