ESEN
Which one to use?Intermediatestructurestructure
Zero conditionalvsFirst conditional
'Zero conditional' expresses general truths (if + present); 'first conditional' expresses possible future situations.
Side-by-side comparison
Zero conditional
structureThe zero conditional uses present + present to talk about general truths or scientific facts: "If you heat water to 100°C, it boils".
If you do not back up your data regularly, you lose important files the moment your hard drive fails.
If the team misses deadlines consistently, client trust erodes and contracts become harder to renew.
If demand exceeds supply, prices go up, that is a basic principle of market economics.
First conditional
structureThe first conditional uses present + future (will) to talk about real and possible situations in the future: "If it rains, we will stay inside".
If the board approves the budget next week, we will start the hiring process for the new engineering positions immediately.
If she finishes the prototype before the end of the month, the team will present it at the investor meeting in April.
If the weather is good this weekend, we will hold the team-building event outdoors in the park.
Common mistake
- •Most common error: using "will" in the IF clause: "If it will rain, we will cancel" = wrong.
- •The IF clause always uses SIMPLE PRESENT: "If it rains, we will cancel." Second error: confusing zero and first, zero = always-true fact ("If you press, it stops"); first = specific possible future ("If you press, it will stop").
Trick to remember it
- •The two parts: IF clause (condition) + main clause (result).
- •Zero: if + present / present (general truth).
- •First: if + present / will (possible future situation).
- •The IF clause never takes "will", is it always true? = zero; could it happen in the future? = first.
Quick rule
- •Zero conditional: if + present / present (always-true facts).
- •First conditional: if + present / will + infinitive (possible and realistic future situations).
- •The IF clause never takes "will" in either type.
Did you know?
Textbooks number English conditionals (0, 1, 2, 3, and sometimes "mixed") as if they were four discrete and separate types, but modern linguists prefer to see them as a continuous spectrum of probability and reality: from absolute certainty (zero) to the counterfactual impossibility of the past (third). "Real" conditionals (zero and first) talk about possible situations; "unreal" ones (second and third) talk about hypothetical or contrary-to-fact situations. Interestingly, the grammatical distinction between zero and first conditional does not exist in Spanish: "si llueve, nos mojamos" can be both a universal truth and a specific future situation. English forces the speaker to be explicit about the nature of the condition.
Practise what you learned
Exercise 1 · Pick the right one
If you heat water to 100°C, it _____ . That's just science.
Exercise 2 · Pick the right one
If it _____ tomorrow, we'll cancel the trip.
Exercise 3 · Form the word
Related word pairs
IfvsWhether
'If' introduces conditions; 'whether' introduces alternatives or is used when 'or not' is implied.
Second conditionalvsThird conditional
The second conditional expresses imaginary present or future situations; the third expresses past situations that did not happen.
WillvsGoing to
"Will" expresses spontaneous decisions, predictions, and promises; "going to" expresses prior plans and intentions decided in advance.
AvsAn
'A' is used before consonant sounds; 'an' is used before vowel sounds.
Bryan López
Founder of SpeakUP Academy