2. ZERO TYPE
General truths. Simple cause and
effect.
If-clause + Main Clause
Simple Present √ Simple Present
If you heat water, it boils.
3. FIRST TYPE
Probable. It refers to the present or future.
If-clause + Main Clause
Simple Present √ Will + bare
infinitive
If you don’t write it down , You will forget.
4. SECOND TYPE
Improbable. Hypothetical. It refers to the present or future.
If-clause + Main Clause
Simple Past √ Would + bare infinitive
If I were you, I would write the business plan.
5. THIRD TYPE
Impossible. Hypothetical. It refers to the past.
If-clause + Main Clause
Past perfect √ Would + perfect
infinitive
If I had been at the I would have met her.
party,
