Conditionals – Zero to Mixed

Conditions connect a situation and a result

An if-clause gives a condition; the main clause gives a result or response. The familiar zero, first, second, third and mixed labels are useful learning patterns, not an exhaustive list of every possible conditional sentence.

Common patterns

• Zero: If I work late, I take the last bus. Present simple + present simple can describe a habit or general relationship. It need not be a universal scientific law.
• First: If the shop is open, I will buy a notebook. Present simple + will can present a real future possibility. The if-clause’s present form refers to future time here.
• Second: If I lived closer, I would walk to class. Past form + would can describe an imagined present or less likely future situation. The past form does not necessarily mean past time.
• Third: If we had booked earlier, we would have found seats. Past perfect + would have + past participle imagines a different past. The feeling may be regret, relief or something else.

Could and might can replace would when ability or possibility is intended: If we had more time, we could visit the museum.

Mixed time references

A past condition can have a present result: If I had saved the address yesterday, I would know where to go now. A continuing present characteristic can explain an imagined past result: If I were more organised, I would have saved the address yesterday. Check the time of each clause instead of memorising just one mixed pattern.

Common advice and its limits

In ordinary future conditions, use If it rains, we will stay inside. However, a blanket ban on will or would after if is wrong. They can express willingness or politeness: If you will wait here, I will find your booking can mean if you are willing to wait.

If I were you is the conventional advice expression. Were is also usual in formal hypothetical clauses. Was occurs in informal hypothetical usage and in ordinary past conditions, so it is not automatically wrong whenever it follows if.

When the if-clause comes first, normally separate it with a comma. When it follows the main clause, a comma is usually unnecessary.

Quick self-check

1. Use the ordinary first-conditional pattern: If the bus ___ (arrive) soon, we will be on time.
2. Use the second conditional: If I had a spare ticket, I ___ (give) it to you.
3. Use the third conditional: If I had met him yesterday, I ___ (tell) him the news.