Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
if it happen
Grammar usage guide and real-world examplesUSAGE SUMMARY
This is not correct or usable in written English; it should be "if it happens." You can use "if it happens" when you are talking about something that might occur.
For example, "I'll call you tomorrow if it happens that I don't have too much work to do today."
⚠ May contain grammatical issues
Science
News & Media
Alternative expressions(5)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
1 human-written examples
'If it happen there is only one person who is assisting … it will be difficult to remember to wrap the baby since she will be concentrating on helping the mother' [FGD mother 44 year old, 2 children, educated to standard 7].
Science
Human-verified similar examples from authoritative sources
Similar Expressions
59 human-written examples
If it happens.
News & Media
If it happens, great.
News & Media
If it happens, that is.
News & Media
So if it happens, it happens".
News & Media
"If it happens, it happens," Mickelson said.
News & Media
"If it happens, it's just happenstance".
News & Media
"If it happens, it does," Chandler said.
News & Media
If it happens, the Russians will return".
News & Media
Terrific if it happens, of course.
News & Media
"If it happens again I'll scream.
News & Media
Expert writing Tips
Best practice
Always use the grammatically correct form "if it happens" in formal and academic writing. The addition of the 's' on 'happens' is crucial for correct subject-verb agreement.
Common error
Don't omit the 's' from "happens" when using the phrase in the third-person singular. Using "if it happen" is a common error that undermines the credibility of your writing.
Source & Trust
86%
Authority and reliability
1.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "if it happen" functions as a subordinate conjunction introducing a conditional clause. However, it's grammatically incorrect; Ludwig AI states that the correct form is "if it happens". The correct phrase sets a condition for the main clause.
Frequent in
News & Media
50%
Science
50%
Formal & Business
0%
Less common in
Academia
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, the phrase "if it happen" is grammatically incorrect and should be avoided in formal writing. The correct form is "if it happens". As highlighted by Ludwig, the addition of the 's' to 'happen' is essential for proper subject-verb agreement. While the corrected phrase serves to introduce a conditional clause, it's important to ensure that the verb conjugation aligns with standard grammatical rules. The phrase is most frequently used in news, media and science contexts, and there are many alternative phrases available to express similar conditional scenarios. Always opt for "if it happens" to maintain grammatical correctness and clarity in your writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
if it happens
Adds the third-person singular present tense conjugation to the verb, correcting the grammatical error.
should it happen
Emphasizes a more formal and hypothetical tone.
in the event that it happens
Introduces a formal condition for something to occur.
if it should come to pass
Implies a less likely or more significant occurrence.
assuming it happens
Highlights the assumption of the event taking place.
on the off chance it happens
Suggests a low probability of occurrence.
if the occasion arises
Refers to a specific opportunity or situation.
were it to happen
Presents a highly hypothetical and often unlikely situation.
supposing it happens
Similar to assuming, but with a slightly more questioning tone.
contingent on it happening
States that something else depends on this event occurring.
FAQs
What's the correct way to say "if it happen"?
The correct way to phrase it is "if it happens". The verb 'happen' needs the third-person singular 's' to agree with the subject 'it'.
When should I use "if it happens" in a sentence?
Use "if it happens" when discussing a possible future event. For example, "I will be surprised if it happens".
What can I say instead of "if it happens"?
You can use alternatives like "should it happen", "in the event that it occurs", or "assuming it happens" depending on the context.
Which is correct, "if it happen" or "if it happens"?
The grammatically correct phrase is "if it happens". The phrase "if it happen" is incorrect due to subject-verb disagreement.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
86%
Authority and reliability
1.8/5
Expert rating
Real-world application tested