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
requires after
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "requires after" is not correct and does not convey a clear meaning in written English.
It is unclear when to use it, as it lacks context and proper grammatical structure. Example: "The project requires after the deadline to submit the final report." (This example is incorrect.)
⚠ May contain grammatical issues
Science
News & Media
Wiki
Alternative expressions(19)
expires after
is valid until
expires on
is good through
will remain in effect until
has been obscured until
good through
has been prolonged until
applied until
this certificate is valid until
effective until
is available until
has been forbidden until
has been closed until
has been used until
is appropriate until
is open until
has been delayed until
is in force until
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
3 human-written examples
While the ultra-lean combustion of hydrogen may reduce the formation of NOx within the cylinder but makes the power density very low, the only lean combustion of hydrogen requires after treatment for NOx reduction.
The effects of EPC on healthcare costs will be measured in part by the number of follow-up visits a patient requires after the initial PC consultation, as recorded by the PC physician.
Science
To prevent the vinegar smell from lingering, wash the microsuede with water or solvent-based solution, whichever your microsuede requires, after applying the vinegar.
Wiki
Human-verified similar examples from authoritative sources
Similar Expressions
55 human-written examples
Career advancement in many professions requires after-work networking events, or sticking with clients' problems until they're solved, or dealing with shockingly regular work emergencies that deliver you home, depleted, a half-hour before lights-out.
News & Media
Bud dormancy in leafy spurge exhibits three well-defined phases of para-, endo- and ecodormancy; however, seed dormancy for leafy spurge is classified as physiological dormancy that requires after-ripening and alternating temperature for maximal germination.
Science
"If they're only required after, then it's too late," Ernst said.
News & Media
Is it time to investigate alternative means of power generation that will not require after-treatment?
ISIBINDI also created a 'safe park' for children who require after-school care.
Formal & Business
Silence may be required after a certain hour.
News & Media
A court confirmation is required after a recommendation.
News & Media
But today's increase was required after reinforcements from Bangladesh, Jordan and India arrived this week.
News & Media
Expert writing Tips
Best practice
When describing sequential processes, ensure clarity by using precise verbs like 'needs', 'demands', or 'entails' instead of the less grammatical "requires after".
Common error
Avoid using "requires after" as it is grammatically awkward. Instead, clarify the relationship between the requirement and the subsequent action by rephrasing to use structures like 'is required following' or 'needs to be done after'.
Source & Trust
82%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "requires after" attempts to link a necessity with a subsequent action, but it is grammatically incorrect. As Ludwig AI suggests, it does not follow standard English grammar rules, leading to ambiguity and lack of clarity.
Frequent in
Science
33%
News & Media
33%
Wiki
33%
Less common in
Formal & Business
0%
Encyclopedias
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "requires after" is considered grammatically incorrect and should be avoided in formal writing. Ludwig AI confirms that the phrase lacks proper grammatical structure, leading to ambiguity. While the intention is to express a sequential relationship where something is needed following an event, better alternatives include "is needed following", "is necessary post", or rephrasing the sentence for improved clarity. Using precise language and correct grammar will ensure effective communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
is needed following
Replaces "requires" with "is needed", creating a more passive construction while maintaining the sequential aspect.
is necessary post
Uses "is necessary" instead of "requires" and "post" to indicate "after", altering the phrasing for emphasis.
demands subsequent
Employs "demands" instead of "requires" and "subsequent" for "after", providing a more formal tone.
entails following
Substitutes "requires" with "entails", giving a sense of logical consequence and "following" for "after".
mandates after
Replaces "requires" with "mandates", suggesting a more authoritative or compulsory need.
calls for following
Changes "requires" to "calls for", indicating a need or request for something to follow.
is essential afterward
Replaces "requires" with "is essential" and uses "afterward" as an adverbial substitute.
necessitates succeeding
Substitutes "requires" with "necessitates" and "succeeding" for "after", providing a more formal and emphatic tone.
depends upon subsequent
Uses "depends upon" to indicate that something is contingent on what follows.
involves subsequent
Replaces "requires" with "involves", indicating that the action after is part of a process.
FAQs
How can I correctly express the idea of something needed after a specific event?
Instead of using the phrase "requires after", which Ludwig AI identifies as grammatically incorrect, you can use alternatives such as "is needed following", "is necessary post", or "demands subsequent" to convey the correct meaning.
What are some alternatives to "requires after" that maintain a formal tone?
For a more formal tone, you could replace "requires after" with phrases like "demands subsequent", "necessitates succeeding", or "mandates after". These options offer a more authoritative and precise expression.
Is "requires after" grammatically correct?
No, "requires after" is not considered grammatically correct in standard English. According to Ludwig AI, it's better to use phrases like "is required following" or rephrase the sentence for better clarity.
What's the difference between "requires after" and "is required after"?
While "requires after" is grammatically awkward and less clear, "is required after" is a more acceptable construction. However, it's often better to use alternatives like "is needed following" or rephrase the sentence for better clarity and flow.
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
2.8/5
Expert rating
Real-world application tested