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
fails to occur
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "fails to occur" is correct and usable in written English.
It can be used to describe a situation where something that was expected or planned does not happen. Example: "The event fails to occur if the necessary conditions are not met."
✓ Grammatically correct
Science
Encyclopedias
News & Media
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
54 human-written examples
If embryonic methylation fails to occur, the embryo dies.
Encyclopedias
Then when the catastrophe fails to occur scientists get the blame.
News & Media
If the negotiating process fails to occur, the opportunity is lost forever.
Academia
It is not known why regeneration fails to occur in many cases, as in the legs of frogs or the limbs and tails of mammals.
Encyclopedias
In the absence of btn gene function the initial commitment to the DM cell fate is made but differentiation fails to occur and the DM cells are lost.
Academia
Cramping usually fails to occur when the same muscles are employed in tasks not associated with the occupation, suggesting a psychological basis for the disorder.
Encyclopedias
Human-verified similar examples from authoritative sources
Similar Expressions
6 human-written examples
Why does capital formation often fail to occur in developing countries?
Academia
Specifically, the decondensation, disassembly and dispersion of the endoreplicated polytene chromosomes fail to occur without Mip120.
Academia
And you'll rarely see a headline about a bad event that failed to occur.
News & Media
However, preeclampsia does not always clinically present when remodeling has failed to occur.
In subsequent cycles, however, these phenomena failed to occur (LiPF6) or were weaker (LiClO4).
Science
Expert writing Tips
Best practice
When using "fails to occur", ensure the context clearly establishes what was expected or intended to happen. This provides clarity and prevents ambiguity.
Common error
While grammatically sound, "fails to occur" can sometimes sound overly formal in casual contexts. Consider using simpler alternatives like "doesn't happen" or "doesn't take place" in everyday conversation.
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "fails to occur" functions as a verbal phrase indicating the non-performance or non-happening of an event or action. It expresses that something expected or intended did not take place. As Ludwig AI confirms, the expression is correct and can be used in written English.
Frequent in
Science
64%
Encyclopedias
9%
News & Media
8%
Less common in
Academia
8%
Wiki
2%
Formal & Business
0%
Ludwig's WRAP-UP
The phrase "fails to occur" is a grammatically correct and frequently used expression to denote the non-happening of an expected event, according to Ludwig AI. It commonly appears in scientific, academic, and encyclopedic contexts. Its purpose is to negate an event, often implying a prior expectation. While versatile, it leans towards a formal register, which writers should consider in less formal communications. When aiming for clarity, ensure the context establishes what the expectation was. Alternatives include "does not happen" or "does not take place", which can offer simpler and more direct options in certain contexts. Overall, "fails to occur" serves as a useful tool for precise, objective reporting, particularly in formal writing.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
does not happen
A more direct and common way to express that something does not take place.
does not take place
Similar to "does not happen", but often used for events or scheduled activities.
does not materialize
Suggests that something expected or planned did not become a reality.
does not come to pass
A more formal or literary way to say that something did not happen.
is prevented from happening
Emphasizes that an external force or circumstance stopped the event.
is averted
Implies that a negative event was successfully prevented.
is avoided
Suggests an intentional effort to prevent something from happening.
is obviated
To anticipate and prevent something.
falls through
Commonly used to describe plans or agreements that do not succeed.
is unrealized
Something planned or aimed to happen remains only a concept and is never put into action.
FAQs
What does "fails to occur" mean?
The phrase "fails to occur" means that something expected, intended, or predicted does not happen or come to pass. It indicates a lack of realization or fulfillment of an event or action.
What can I say instead of "fails to occur"?
You can use alternatives like "does not happen", "does not take place", or "does not materialize" depending on the context.
Is it better to say "does not occur" or "fails to occur"?
Both "does not occur" and "fails to occur" are grammatically correct, but "fails to occur" implies an expectation or requirement that something should happen but didn't. "Does not occur" is a more neutral statement of absence.
How do I use "fails to occur" in a sentence?
Use "fails to occur" to describe a situation where an anticipated event or process does not happen. For example, "If embryonic methylation "fails to occur", the embryo dies."
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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested