This document discusses different types of conditional sentences in English. Zero conditional sentences express facts that are always true, such as "If you freeze water, it turns into ice." First conditional sentences refer to possible or probable events in the present or future, like "If you read for a long time, you feel dizzy." Second conditional sentences refer to improbable or hypothetical events, as in "If you didn't have breakfast, you'd get a headache."

1. Conditional
Sentences
Zero conditional
First conditional
Second conditional

2. If you freeze water, it turns into ice.
IF clause MAIN clause

3. Zero conditional sentences:
Express facts that are always true

4. When the if clause
comes first, we use
a comma between
the two clauses.
It depends on the
main clause.
It can stand on its
If you change the order
own.
you don’t change the
meaning of the
sentence.

5. 1. If you read for a long a. It melts.
time,
2. If you boil water, b. You feel dizzy.
3. If you don’t have c. You get a headache.
breakfast
4. If you heat ice, d. It evaporates.