if

if — conjunction

1. This word introduces a necessary situation — the result you describe can take pl

1.conjunctionA1
Definition

This word introduces a necessary situation — the result you describe can take place only after that situation has happened first.

Example

If it rains tomorrow, Manuela will take the bus to work.

if + present, main clause with will for real future

The cake will rise properly only if you add enough eggs to the mixture.

main clause + only if + condition clause

Common collocations
  • if + then
  • only if
  • even if
  • what if
Synonyms
Antonyms
  • whether or not

    means the result is the same regardless of the condition

Grammar Patterns

if + present tense, … + will + base verb

if + past tense, … + would + base verb

if + past perfect, … + would have + past participle

if + present, … + present (zero conditional for general truths)

Usage Note

In conditional clauses, do not use 'will' or 'would' inside the if-clause itself ('If it rains…' not 'If it will rain…'), except in polite requests (sense 6). For unreal or imaginary situations in the present, the past subjunctive form 'were' is used for all subjects ('If I were you…'), though 'was' is common in informal British English.

Common Mistakes

If it will rain, we will stay home.
If it rains, we will stay home.
The if-clause takes present tense, not 'will,' even when the meaning is future.
If I would be rich, I would travel the world.
If I were rich, I would travel the world.
The second conditional uses past tense (or 'were') in the if-clause, never 'would.'
If trust the internet for answers, you may get wrong information.
If you trust the internet for answers, you may get wrong information.
The if-clause needs a subject.

2. You use this word to show that something is true, even though another fact might

2.conjunctionB2
Definition

You use this word to show that something is true, even though another fact might suggest the opposite — often to admit a weakness while keeping your main point.

Example

The meal was delicious, if a little too salty for my taste.

if + adjective phrase after a positive statement

Sari is a kind person, if sometimes quick to get angry.

Common collocations
  • if not brilliant
  • if a little
  • if somewhat
Synonyms
  • although

    more common and less formal; can start a sentence

  • though

    even more conversational than 'although'; often placed at the end

  • even if

    stronger contrast; suggests the limitation does not change the outcome

Grammar Patterns

if + adjective/adverb

if + clause

Usage Note

This sense always appears after a positive statement and introduces a limitation or weakness. It is common in written British English but less frequent in casual American speech. The clause after 'if' is usually shortened to an adjective or adverb phrase.

Common Mistakes

If it was cold, we went for a walk.
We went for a walk, if it was cold.
Sense 2 requires the concessive 'if' to appear after the main positive statement, not before it.

3. You use this word to say that one thing always happens immediately after or as a

3.conjunctionB1
Definition

You use this word to say that one thing always happens immediately after or as a result of another thing happening — like saying 'every time' or 'whenever.'

Example

If the doorbell rings, the dog starts barking loudly.

if = whenever: a habitual reaction

Sade takes three deep breaths if she feels nervous before a test.

if = every time: describing a personal routine

Common collocations
  • if + always/reliably
Synonyms
  • whenever

    clearer and more precise for this meaning; preferred in modern usage

  • every time

    more emphatic; used in speech

  • when

    casual; can replace 'if' in this sense in everyday conversation

Grammar Patterns

if + present, … + present

Usage Note

Distinguish from sense 1: sense 3 describes a reliable pattern ('every time X happens, Y happens'), while sense 1 describes a one-time possibility ('if X happens, Y will happen'). In sense 3 both verbs are usually in the present tense and the main clause never contains 'will.'

Common Mistakes

If it will rain, the roof leaks.
If it rains, the roof leaks.
Sense 3 does not use 'will' in either clause; it states a regular fact.

4. You use this word when you accept something as true for the moment and then say

4.conjunctionB1
Definition

You use this word when you accept something as true for the moment and then say what follows from that — often before stating an opinion, a reaction, or a decision based on that fact.

Example

If you have already finished your homework, you may go outside to play.

if = since / given that: accepting a completed action

If Ravindra's story about the delay is correct, the train should arrive at noon.

if + accepted premise, conclusion follows

Common collocations
  • if + then
  • if that is the case
  • if so
Synonyms
  • since

    more direct; sounds more confident about the premise

  • given that

    formal; used in academic or analytical writing

  • assuming

    shifts focus to a hypothesis rather than an accepted fact

Grammar Patterns

if + clause (accepted fact), main clause

Usage Note

This sense differs from sense 1 in that the condition is already accepted as true, not hypothetical. It often occurs with 'then' in the main clause and is very common in reasoning and argument. A good test: replace 'if' with 'since' or 'given that' and the sentence should still make sense.

Common Mistakes

If you are here already, I will call you later when you arrive.' — The second half contradicts the first because the premise ('you are here') is accepted.
If you are here already, let us start the meeting.
The conclusion follows naturally from the accepted premise.

5. You use this word after verbs such as ask, know, wonder, or tell to introduce a

5.conjunctionB1
Definition

You use this word after verbs such as ask, know, wonder, or tell to introduce a question that has two possible answers — like 'yes' or 'no' — without using a direct question form.

Example

Christopher asked if the library was open on Sunday afternoons.

ask + if: indirect yes/no question

I wonder if Yael has received my email about the conference.

Common collocations
  • ask if
  • wonder if
  • know if
  • see if
  • decide if
Synonyms
  • whether

    more formal; preferred before infinitives and 'or not'

  • whether or not

    emphasizes both possibilities equally

Grammar Patterns

verb + if + clause (indicative)

verb + if + not + clause

Usage Note

In this sense 'if' and 'whether' are often interchangeable, but 'whether' is preferred (a) before infinitives ('whether to go'), (b) after prepositions ('the decision about whether'), and (c) when 'or not' follows immediately ('whether or not'). In short, everyday indirect questions, 'if' is more common in both British and American English.

Common Mistakes

He asked me that I wanted coffee.
He asked me if I wanted coffee.
Indirect questions use 'if' or 'whether,' not 'that.'
I wonder that she will come.
I wonder if she will come.
'Wonder' is not followed by 'that'; it requires 'if' or 'whether.'

6. You use this word to make a request, offer, or suggestion sound more polite and

6.conjunctionA2
Definition

You use this word to make a request, offer, or suggestion sound more polite and less direct, often with words like 'could,' 'would,' 'may,' or 'might.'

Example

If you could pass me the salt, that would be great.

if you could + verb: polite request at the table

I was wondering if you might have time to look at my report.

Common collocations
  • if you could
  • if I may
  • if you would like
  • I wonder if
  • if it's not too much trouble
Synonyms
  • whether you'd like

    used in very formal offers, e.g. 'I wondered whether you'd like to join us'

Grammar Patterns

if + pronoun + would/could + verb

if + I + may/might + verb

if + you + could + verb

Usage Note

This is one of the few cases where 'will' or 'would' can appear inside the if-clause ('If you would like…,' 'If you could…'). In very formal British English 'if you would be so kind as to…' is used. In everyday speech, 'if' can be omitted in short polite phrases: 'Could you pass the salt?' is already polite without 'if.'

Common Mistakes

If you can pass me the salt.' (too direct — sounds like a condition, not a request)
If you could pass me the salt.
'Could' makes it polite.
Idioms

even if

idiom

Used to say that something will happen no matter what the situation is.

Maya will finish the race even if she feels tired.

Even if it rains, Diego plans to go hiking tomorrow.

if and when

idiom

Used to refer to a possible future event that may or may not happen.

If and when the package arrives, please call me.

We will discuss the budget if and when the manager returns.

if anything

idiom

Used to suggest that the opposite of a previous statement is true, or to emphasize an opinion.

The movie wasn't boring; if anything, it was too exciting.

If anything, Sara's new job is more stressful than her old one.

if I were you

idiom

Used to give advice to someone by imagining yourself in their situation.

If I were you, I would apologize to Lisa immediately.

If I were you, I'd take that job offer without hesitation.

if not

idiom

Used to introduce an alternative when the previous condition is not true.

Are you coming to the party? If not, let me know.

We can meet on Friday; if not, Saturday works too.

if only

idiom

Used to express a strong wish that something were true or had happened.

If only I had studied harder for the exam.

If only Brian could join us for the trip.

if so

idiom

Used to refer to a situation that has just been mentioned, meaning 'if that is true'.

Do you need help? If so, please raise your hand.

Is the meeting still on? If so, I'll prepare the slides.

it’s not as if

idiom

Used to show that something is surprising because there is no good reason for it.

It's not as if she has no experience; she worked for years.

It's not as if we are late; the train hasn't arrived yet.

only if

idiom

Used to say that one thing must happen before another can happen.

You can borrow my car only if you promise to drive carefully.

Only if the weather improves will the game be played.

if — noun

Synonym discussion

Sense: conjunction/1

All four express a condition that must be met, but they differ in tone and emphasis. 'If' is neutral and covers every kind of condition, from real possibilities ('If it rains…') to unreal ones ('If I were you…'). 'Provided that' and 'on condition that' are more formal and make the condition sound like a strict requirement — you see them in contracts, rules, and official notices. 'As long as' is conversational and implies the condition is the only thing you care about ('You can borrow the car as long as you fill the tank'). 'Assuming' shifts the focus to a hypothesis that the speaker believes is true ('Assuming the data is correct…'). In everyday English, 'if' works in all these situations; the other options add a specific nuance about how firm or likely the condition is.

provided thatas long ason condition thatassuming

Common collocations

Nouns

  • ifs
  • ifs and buts

Adverbs

Phrases

Etymology

Proto-Indo-EuropeanProto-GermanicOld EnglishMiddle EnglishEnglish

The word 'if' comes from Old English 'gif' (pronounced with a hard g), which meant 'if, whether, or if only.' It traces back to the Proto-Germanic root '*jabai' (meaning 'on condition that'), which is related to the Old Norse 'ef,' Old High German 'ibu,' and Gothic 'jabai.' The Proto-Indo-European root '*yo-' is a relative pronoun stem, also found in Greek 'hos' (who, which) and Sanskrit 'yas' (who, which). The shift from a relative pronoun ('that which') to a conditional conjunction ('on condition that') happened early in Germanic, long before Old English was written down.