What is the zero conditional?
We use the zero conditional when we want to talk about facts or things that are generally true.
Scientific facts are often covered by the zero conditional:
– When you heat ice, it melts.
– When fish don’t eat enough, they die.
The zero conditional uses if or when and must be followed by the simple present or imperative.
FORM:
If/when + simple present, simple present (or imperative).
Simple present if/when simple present.
EXAMPLE:
When you go to the park, take your ball. (imperative)
When you press the button, the doorbell rings.
The doorbell rings if you press the button.
