We use the 0 Conditional to talk cause and effect, and things that always happen or that are always true. For example, if you don’t eat, you get hungry.
If + Present Simple, Present Simple.
If you touch a hot stove, you burn your hand.
If you don’t go to work, you lose your job.
If you don’t practice, you don’t improve.
You can use ‘when’ instead of ‘if’ to mean the same thing.
Let’s take turns asking and answering questions in the 0 conditional:
What happens when…
you do a lot of exercise?
someone puts water in the freezer?
a friend stands you up?
your alarm clock goes off in the morning?
there is a rain storm?
a person eats too much?
you don’t go to bed early enough?
you work really hard?