The zero conditional is a structure used for talking about general truths -- things which always happen under certain conditions. This page will explain how the zero conditional is formed, and when to use it.
The structure of a zero conditional sentenceA zero conditional sentence consists of two clauses, an "if" clause and a main clause (note that most zero conditional sentences will mean the same thing if "when" is used instead of "if"):
If the "if" clause comes first, a comma is usually used. If the "if" clause comes second, there is no need for a comma:
We use the same verb form in each part of a zero conditional: the simple present tense:
Using the zero conditionalThe zero conditional is used to talk about things which are always true -- scientific facts, general truths, and so on: