The zero conditional tense describes a result that has one hundred percent (100%) probability of occurring under the specified condition or situation. We use the simple present preceded by “if” and the simple present to describe the result.
If you heat ice, it melts.
If I miss the 8:00 am train, I am late for work.
If he is late for work, his boss gets angry.
If they do not study, they do not pass the exam.
If the baby doesn’t eat at 3:00, she begins to cry.
If you never give up at doing something, you eventually become successful.