Unit 3

 Zero Conditional

The Zero Conditional is used to talk about general facts, scientific truths, habits, or situations that always happen when a condition is met.

Structure:

If + sujeto + verbo en presente simple, sujeto + verbo en presente simple

Examples:

* If you heat water, it boils.

* If it rains, the grass gets wet.

* If plants don’t get water, they die.

Characteristics

*Both clauses use the simple present tense.

*It expresses situations that are always true.

*The order of the clauses can be changed without changing the meaning.

*Sometimes if can be replaced by when.

Main uses

1. Scientific truths:

*If water reaches 100°C, it boils.

2. General facts:

*If you don’t eat, you get hungry.

3. Habits:

*If I have time, I read a book.

4. Instructions:

*If you need help, call me.