If sentences in English: zero to third conditional

English “if” sentences use four basic patterns: the zero conditional for things that are always true, the first for a real possibility, the second for an imaginary present situation, and the third for something that did not happen in the past. The pattern depends on how real the event is and when it happens.

Zero and first conditional

Zero: if + present simple, present simple. It is for general truths and habits: “If you heat ice, it melts.” First: if + present simple, will + verb. It is for possible future situations: “If it rains tomorrow, we will stay at home.” Note: “will” does not go in the “if” part; not “If it will rain”, but “If it rains”.

Second conditional

If + past simple, would + verb. It is for situations that are not real now or are unlikely: “If I had more time, I would learn the guitar.” The tense is past, but the meaning is about the present. A common pattern for advice: “If I were you, I would call her.”

Third conditional

If + past perfect, would have + past participle. It imagines something that did not happen in the past and its result: “If she had left earlier, she would have caught the train.” (She didn't leave early and missed the train.) It is used for regrets or comments about the past.

Common mistakes for Turkish speakers

Because the Turkish ending “-se/-sa” can cover all four situations, the patterns are often mixed up. The most common mistake is putting “would” in both parts: not “If I would know, I would tell you”, but “If I knew, I would tell you”. The second is adding “will” to the “if” part of a first conditional.

A short exercise

Write one sentence about yourself for each pattern: a general truth (zero), a plan for tomorrow (first), a dream (second), and something you would have done differently in the past (third). Then mark the tense in both parts of each sentence.

To keep going, see Will or going to? Talking about the future in English and Present perfect or past simple? The difference.

Frequently asked questions

“If I was” or “If I were”? Both are used; “If I were you” is more common in the advice pattern and more formal in writing.

Can the “if” part come at the end? Yes: “We will stay at home if it rains.” In that order, no comma is needed.