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
that requires a
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that requires a" is correct and usable in written English.
You can use it when describing a need or necessity for something in a particular context. Example: "The project that requires a significant amount of funding is still in the planning stages."
✓ Grammatically correct
News & Media
Wiki
Academia
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
60 human-written examples
Happily, that requires a board.
News & Media
I want to find a job that requires a degree.
News & Media
But it's also one that requires a little clarity.
News & Media
It's an exoskeleton that requires a driver.
News & Media
Anything beyond that requires a special circumstance.
News & Media
Often we play stuff that requires a little more patience.
News & Media
It's a practice that requires a lot of attention.
News & Media
Find an article that requires a cleanup.
Wiki
That requires a rethink.
News & Media
That requires a trade-off.
News & Media
That requires a speedy internet.
News & Media
Expert writing Tips
Best practice
Use "that requires a" when you want to explicitly state that a particular action, condition, or resource is essential for something else to occur or succeed. Be sure the connection between the requirement and the outcome is clear to the reader.
Common error
Avoid using "that requires a" in overly simple sentences where a more direct verb could suffice. For instance, instead of "The task that requires a lot of time", consider using "The task is time-consuming".
Source & Trust
84%
Authority and reliability
4.3/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that requires a" functions as a relative clause introducing a necessary condition or element. According to Ludwig, this phrase is both correct and usable. It indicates that something is essential or indispensable for a particular outcome or purpose, as demonstrated in the Ludwig examples.
Frequent in
News & Media
50%
Wiki
13%
Academia
13%
Less common in
Formal & Business
0%
Science
0%
Encyclopedias
0%
Ludwig's WRAP-UP
In summary, "that requires a" is a grammatically correct and usable phrase, as affirmed by Ludwig, which serves to introduce a necessary condition or element. While not exceedingly common, it appears most frequently in news and media contexts. When writing, ensure that you use the phrase to clearly establish a prerequisite or necessity, avoiding overuse in overly simple sentences. Alternatives such as ""that necessitates a"" or ""that demands a"" can be used to vary your language. Ludwig’s examples underscore the versatility and correctness of this phrase across various writing styles.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
that necessitates a
Replaces 'requires' with 'necessitates', emphasizing a stronger sense of obligation or inevitability.
that demands a
Substitutes 'requires' with 'demands', suggesting a firm expectation or need.
that calls for a
Uses 'calls for' instead of 'requires', indicating a need or request for something.
that entails a
Replaces 'requires' with 'entails', highlighting that something is a necessary consequence or part of something else.
that involves a
Substitutes 'requires' with 'involves', focusing on the inclusion of something as a component or step.
that depends on a
Emphasizes the reliance on something using 'depends on' instead of 'requires'.
that hinges on a
Indicates that the outcome or success is highly dependent on something, using 'hinges on'.
that is predicated on a
Replaces 'requires' with 'is predicated on', highlighting that something is based or founded on something else.
that necessitates having a
Adds 'having' to emphasize possession of something is needed.
that is conditional on a
Expresses the conditionality of something.
FAQs
How can I use "that requires a" in a sentence?
Use "that requires a" to indicate a necessary condition or element. For example, "Completing the project "that requires a" significant investment of time and resources will be challenging."
What are some alternatives to "that requires a"?
Alternatives include "that necessitates a", "that demands a", or "that calls for a", depending on the specific nuance you want to convey.
Is there a difference between saying "that requires a" and "that needs a"?
While both phrases convey a similar meaning, "that requires a" often suggests a more formal or essential necessity, whereas "that needs a" can be more casual. The choice depends on the context and the desired tone.
Can "that requires a" be used in all types of writing?
"That requires a" is suitable for most types of writing, but consider your audience and the overall tone. In very informal contexts, "that needs a" might be more appropriate.
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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
4.3/5
Expert rating
Real-world application tested