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
a duplicate of that
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a duplicate of that" is correct and usable in written English.
It can be used when referring to an exact copy or reproduction of something previously mentioned. Example: "Please provide me with a duplicate of that document for my records."
✓ Grammatically correct
Science
News & Media
Alternative expressions(3)
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
2 human-written examples
Then on May 2 Burnley, who also have an interest in the title, visit Manchester City, whose parlous state is a duplicate of that 12 months ago.
News & Media
A reprogrammed phone uses an IMEI number that is a duplicate of that of a legitimate phone in order to be able to login to the network when its original IMEI is blacklisted (Kaplankiran et al. 2008).
Science
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
Not only was Google+ Local a duplicate of functionality that is better served elsewhere, the app itself was struggling to gain adoption.
News & Media
Primates have a duplicate of LWS that has mutated to have its absorption maximum in green, namely OPN1MW.
Science
ENSTGUG00000013021 itself appears to be a duplicate of KCNK16 that is orthologous to genes found in chicken (ENSGALG00000012021), lizard (no model; chrUn_GL343261: 1,882,731 - 1,899,265), and frog (ENSXETG00000011960), each annotated as novel, hypothetical protein, or protein fragment.
Science
This article has been retracted by the Editor in Chief of Mathematical Sciences as it has been brought to his attention that it's a duplicate of a paper that had first been submitted to Iranian Journal of Mathematical Sciences and Informatics and published there under the same title in iss.
Science
Armistad Docks The Freedom schooner Armistad, a duplicate of the ship that was taken over by slaves off Montauk in 1839, pulls into Sag Harbor on Friday.
News & Media
(ii) Type II, found in CCMP529, CCMP525 and CCMP505, possessed a petJ- psbV- clpC-I that was an exact duplicate of that in IRb.
Science
It was a duplicate of the one that appeared, correctly, with the listing for 49 Boulder Ridge in Greenburgh, N.Y.
News & Media
In Canada, in 1980, the interest rates shot way up, and we had a duplicate of the problem that we saw in the U.S. People couldn't afford to refinance their mortgages, and a lot of people lost their homes.
Academia
The new building is a duplicate of an adjacent building that was converted and renovated two years ago.
News & Media
Expert writing Tips
Best practice
Use "a duplicate of that" when you want to emphasize that something is an exact copy of something else already mentioned, particularly when precision is important.
Common error
In casual conversation, consider using simpler alternatives like "a copy of that" or "the same as that" to avoid sounding overly formal or technical.
Source & Trust
86%
Authority and reliability
4.3/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a duplicate of that" functions as a prepositional phrase, typically acting as an adjective modifying a noun or pronoun. As Ludwig AI indicates, it refers to something being an exact copy or reproduction of something previously mentioned.
Frequent in
Science
50%
News & Media
50%
Formal & Business
0%
Less common in
Encyclopedias
0%
Wiki
0%
Academia
0%
Ludwig's WRAP-UP
The phrase "a duplicate of that" is a grammatically correct prepositional phrase used to indicate an exact copy or replica of something previously referenced. As Ludwig AI confirms, it's suitable for various contexts. While "a copy of that" serves as a common alternative, "a duplicate" emphasizes a higher level of precision. The phrase appears more frequently in scientific and news contexts, maintaining a neutral register. When precision matters, using "a duplicate of that" ensures clarity.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a copy of that
Replaces "duplicate" with "copy", focusing on the replication aspect.
an identical version of that
Emphasizes the identical nature of the copy.
a replica of that
Suggests a close reproduction, possibly on a smaller scale or for display.
a carbon copy of that
Implies an exact copy, typically made using carbon paper (though the phrase is used metaphorically now).
a facsimile of that
Highlights the replication of the entire form and content.
a reproduction of that
Focuses on the act of recreating the original.
a mirrored version of that
Implies a copy that is exactly the same but flipped, as in a mirror image.
a counterpart to that
Suggests a corresponding item that serves a similar purpose.
an equivalent of that
Highlights functional similarity rather than exact duplication.
a clone of that
Indicates an exact genetic or digital copy.
FAQs
What can I say instead of "a duplicate of that"?
You can use alternatives like "a copy of that", "an identical version of that", or "a replica of that" depending on the specific context.
How do I use "a duplicate of that" in a sentence?
"A duplicate of that" is used to indicate something is an exact copy of something previously mentioned. For example: "Please provide me with a duplicate of that document".
Is it grammatically correct to say "a duplicate of that"?
Yes, it is grammatically correct. The phrase follows standard English grammar rules and is widely understood.
What is the difference between "a duplicate of that" and "a copy of that"?
While both phrases mean something very similar, "a duplicate of that" implies a higher level of exactness compared to "a copy of that". A duplicate is typically an exact replica.
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
86%
Authority and reliability
4.3/5
Expert rating
Real-world application tested