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
which frequently occurs
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "which frequently occurs" is correct and usable in written English.
It can be used to describe an event or situation that happens often or regularly. Example: "In this region, heavy rainfall which frequently occurs can lead to flooding."
✓ Grammatically correct
Science
Academia
News & Media
Alternative expressions(1)
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
41 human-written examples
Disruption of circadian rhythms, which frequently occurs during night shift work, may be associated with cancer progression.
Academia
Consideration of the causes of unilateral paranasal sinusitis, which frequently occurs in routine medical care and is often associated with odontogenic infection.
Science
Furthermore, the lesion responsible for prosopagnosia, which frequently occurs with landmark agnosia, seems to involve the posterior half of the lingual and fusiform gyri.
Science
Objective: Hemodynamics has been implicated in the late failure of arterial bypass grafts, which frequently occurs at the distal anastomosis site.
Science
At Merck, where Jay served as Chief Strategy and Business Development Officer and President of Emerging Businesses, "alternate realities" were used to prevent "team think," which frequently occurs when organizations believe the conventional view of a situation is the correct one.
News & Media
In the present paper, the entropy generation and optimal Reynolds number for developing forced convection in a double sine duct with various wall heat fluxes, which frequently occurs in plate heat exchangers, are studied based on the entropy generation minimization principle by analytical thermodynamic analysis as well as numerical investigation.
Human-verified similar examples from authoritative sources
Similar Expressions
19 human-written examples
Co-occurring comorbidities, that is, 2 comorbidities which frequently occur together, are part of a larger phenomenon of multiple morbidity [ 3].
Science
This function performs poorly for highly non-Gaussian distributions, which frequently occur in microbiome data in the form of zero-inflated abundance distributions.
Science & Research
Verse works on mathematics and astronomy faced the special challenge of verbally representing numbers (which frequently occurred in tables, constants, and examples) in strict metrical formats.
Encyclopedias
The program's purpose is to encourage homework collaboration, which frequently occurred before collaboration became "legal," said Professor Alan Davison, who teaches 5.11.
For example, the Sanders campaign pointed to the timing of the DNC-organized primary debates, which frequently occurred at times where a small audience was likely to tune in.
News & Media
Expert writing Tips
Best practice
When using "which frequently occurs", ensure the clause provides essential information or clarification to the main sentence. If the clause is non-essential, consider using "that frequently occurs" or rephrasing for better flow.
Common error
Avoid using "which frequently occurs" when "that frequently occurs" is more appropriate. "Which" should introduce non-restrictive clauses (adding extra information), while "that" should introduce restrictive clauses (essential to the sentence's meaning).
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "which frequently occurs" functions as a relative clause, providing additional, non-essential information about the noun it modifies. As Ludwig AI confirms, it is a valid and usable phrase. The examples from Ludwig show its common use in various fields.
Frequent in
Science
76%
Academia
12%
News & Media
8%
Less common in
Encyclopedias
4%
Formal & Business
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, "which frequently occurs" is a grammatically correct and relatively common phrase used to introduce non-essential information about an event or condition. As indicated by Ludwig AI, it's appropriate in various writing styles, especially scientific and academic. Remember that "which" introduces non-restrictive clauses while “that” introduces restrictive clauses. While there are many alternative phrases, such as "that often happens", the choice depends on the desired level of formality and emphasis. The phrase is seen primarily in scientific and academic contexts, as supported by Ludwig's examples.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
that often happens
Replaces "frequently occurs" with a more direct and common expression, simplifying the sentence structure.
that is a common occurrence
Transforms the phrase into a more nominal structure, emphasizing the event's commonality.
that tends to happen
Shifts the focus to the tendency of an event to occur, implying a probability rather than a certainty.
which is a regular event
Substitutes "frequently occurs" with a more descriptive noun phrase, highlighting the event's regularity.
that commonly arises
Replaces "occurs" with "arises", suggesting the event emerges or comes into being often.
that is often the case
Uses a more idiomatic expression to convey that something happens frequently, shifting the focus to a general situation.
that repeats often
Focuses on the repetition of an event, emphasizing its recurring nature.
which is a familiar phenomenon
Presents the event as a known and recognized phenomenon, adding a layer of familiarity.
that recurs frequently
Replaces "occurs" with "recurs", specifically highlighting the recurring nature of the event.
that habitually happens
Implies the event is a habitual occurrence, suggesting a pattern or routine.
FAQs
How can I use "which frequently occurs" in a sentence?
Use "which frequently occurs" to add extra, non-essential information about a noun. For instance, "The process, which frequently occurs in nature, is difficult to replicate in a lab."
What is a good alternative to "which frequently occurs"?
Alternatives include "that often happens", "which is a common occurrence", or "that tends to happen", depending on the context.
Is there a difference between "which frequently occurs" and "that frequently occurs"?
Yes. "Which frequently occurs" introduces a non-restrictive clause, while "that frequently occurs" introduces a restrictive clause. Use "which" for extra information and "that" for essential information. For example: "The problem that frequently occurs is easily solved", vs. "The problem, which frequently occurs, requires immediate attention".
When is it appropriate to use "which frequently occurs" instead of simpler alternatives?
Use "which frequently occurs" when you want to add a more formal or descriptive tone to your writing, or when the frequency of occurrence is a key detail to emphasize.
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
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested