If I do ... and If I did ...

Real vs Unreal: The Core Difference

When something is a real possibility, use if + present simple. When something is imaginary or you don’t expect it to happen, use if + past simple. The past tense does not refer to past time here — it signals that the situation is unreal.

• We’re choosing between two suppliers. If we go with Nakamura Ltd, it will be cheaper.
• We’ve already signed the contract with a different supplier. If we went with Nakamura Ltd, it would be cheaper, but the deal is done.

In the first sentence, the choice is still open — it might happen. In the second, the decision is already made, so the speaker is imagining a different situation.

If + Present Simple (Real / Possible)

Use if + present simple when the situation is possible or likely. The result clause normally uses will.

• If the client approves the design, we will start production next week.
• If you find any errors in the spreadsheet, can you let me know?
• If the meeting runs late, I ‘ll skip lunch.
• If he doesn’t reply by Friday, we ‘ll contact someone else.

If + Past Simple (Unreal / Imaginary)

Use if + past simple when the situation is not real, not expected, or purely imaginary. The result clause normally uses would.

• What would you do if you won the company lottery? (you don’t really expect to win)
• If there was an office fire, would you know where the emergency exits are? (there is no fire — you are imagining)
• I‘d be surprised if they didn’t come to the product launch. (I expect them to come)

Comparing If I Find and If I Found

Sometimes the same verb appears in both patterns. The difference is whether the speaker sees the situation as real or imaginary.

• I think I left my badge at your desk. If you find it, can you bring it to me? (it is likely you will find it)
• If you found a company credit card on the floor, what would you do with it? (you are imagining a situation)

Don’t Use Would in the If-Clause

A common mistake is putting would in the if-part of the sentence. Keep would in the result clause only.

• If we went by train, it would be faster. (not If we would go)
• I‘d be very nervous if a senior director asked me to present. (not if a senior director would ask)
• I’m not leaving yet. If I left now, I wouldn’t finish the report. (not If I would leave)

Could and Might in the Result Clause

You can use could (= would be able to) or might (= would possibly) instead of would.

• If I got the promotion, I might move to the Singapore office. (it’s possible I would move)
• If it stopped raining, we could have the team lunch outside. (we would be able to)
• If the budget increased, we could hire two more people.

Quick Self-Check