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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
could have extended
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "could have extended" is correct and usable in written English.
It is typically used to express a possibility or hypothetical situation in the past regarding an extension of time, space, or another concept. Example: "If we had more resources, we could have extended the deadline for the project."
✓ Grammatically correct
News & Media
Encyclopedias
Science
Alternative expressions(20)
could have been transmitted
would have conveyed
could have spent
could have attended
may have forwarded
should have transmitted
could have issued
could have communicated
could have responded
could have relayed
could have mailed
could have continued
could have got sent
might have dispatched
could have recommended
could have dispatched
could have been done
could have mail
could have sent
could have disseminated
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
58 human-written examples
"It could have extended to the building.
News & Media
Or an old manager or record company could have extended the copyright without asking," he says.
News & Media
China's control of South Asian waters could have extended to a landing in Australia in the early 15th century.
Encyclopedias
But he will play, and Adelman said he could have extended minutes on nights the team responded to his creativity.
News & Media
Meanwhile Boro's Dimi Konstantopoulos was only really tested by a weak shot from Joe Lolley and Adomah could have extended the home lead on the counterattack.
News & Media
For example, someone could have extended @replies or hearts to things or places or songs or whatever, not just Tweets and Twitter accounts.
News & Media
The gusty winds and messy field forced Groh to pass up two first-half field-goal opportunities from Detroit's 36-yard line that could have extended the lead.
News & Media
The last survivor here who could have extended this sequence was the 17-year-old Czech Nicole Vaidisova, who lost to Kuznetsova in the semi-finals.
News & Media
"We've been unlucky in front of goal and we could have extended our lead, but in fairness, there was only going to be one winner.
News & Media
For all that, Oakland could have extended Giambi for six years last March, but refused to give him a no-trade clause.
News & Media
He missed several putts from 12 to 14 feet that could have extended his lead, but he liked his chances as well as anyone's.
News & Media
Expert writing Tips
Best practice
Use "could have extended" to express a hypothetical past action that would have resulted in something being longer, larger, or more prolonged. Ensure the context clearly indicates what would have been extended and under what conditions.
Common error
Avoid using "could have extended" when the context requires a different tense or a more direct statement of fact. For instance, if the extension actually happened, use "extended" instead of "could have extended".
Source & Trust
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "could have extended" functions as a modal verb phrase indicating a hypothetical possibility in the past. It suggests that an action of extending something was possible but did not occur. Ludwig AI confirms this usage across numerous contexts.
Frequent in
News & Media
60%
Science
20%
Encyclopedias
10%
Less common in
Formal & Business
3%
Wiki
3%
Reference
4%
Ludwig's WRAP-UP
In summary, "could have extended" is a versatile phrase used to express a past possibility of prolonging or expanding something. Ludwig AI identifies it as grammatically sound and prevalent across varied sources like news, science, and encyclopedias. While seemingly straightforward, nuances exist; choosing between "could have", "would have", or "should have" is essential for conveying the correct meaning. Common errors involve misuse of tense or context, so paying close attention to the intended meaning is crucial. Alternatives like "might have prolonged" or "could have lengthened" can add precision depending on the context.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
might have prolonged
Implies a possibility of making something last longer, similar to extending, but often suggests a temporal aspect.
could have lengthened
Focuses on making something longer in length or duration, similar to extending.
could have expanded
Suggests an increase in size, scope, or range, similar to extending in a broader context.
could have continued
Implies maintaining an activity or state without interruption, similar to extending a process.
might have broadened
Suggests widening or increasing the scope of something, similar to extending influence or impact.
could have stretched
Focuses on making something cover a larger area or last longer, physically or metaphorically.
could have augmented
Implies increasing something by adding to it, similar to extending resources or capabilities.
might have prolonged the duration
Specifically emphasizes the extension of time.
could have amplified
Suggests increasing the effect or intensity of something, similar to extending impact or reach.
could have perpetuated
Implies causing something to continue indefinitely, often used in the context of traditions or systems.
FAQs
How can I use "could have extended" in a sentence?
Use "could have extended" to describe a past possibility that didn't occur, like "If we had more funding, we "could have extended" the project deadline."
What's a good alternative to "could have extended"?
Alternatives include "might have prolonged", "could have lengthened", or "could have expanded" depending on the specific nuance you want to convey.
Is it correct to say "would have extended" instead of "could have extended"?
While both are grammatically correct, "could have extended" implies a possibility that wasn't realized, while "would have extended" suggests a certainty given certain conditions. Choose based on the intended meaning.
What is the difference between "could have extended" and "should have extended"?
"Could have extended" indicates a potential action that didn't happen, while "should have extended" implies an obligation or recommendation that was not followed. For example, "They "could have extended" the offer" vs. "They "should have extended" the offer".
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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
85%
Authority and reliability
4.5/5
Expert rating
Real-world application tested