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 is by
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "that is by" is correct and usable in written English.
It can be used when introducing an explanation, as in this example sentence: I have grown to understand the importance of self-care, that is by taking time out for myself each day.
✓ Grammatically correct
News & Media
Science
Academia
Alternative expressions(20)
that results from
that stems from
that is derived from
that is a consequence of
resulting from
caused by
due to
Because of
arising from
stemming from
because of
as a consequence of
attributed to
brought about by
that represents from
that source from
that generates from
that originates in
that derives from
that is attributable to
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
59 human-written examples
A decision that is, by the way, under appeal.
News & Media
What an unforgettable image that is, by the way.
News & Media
And it's a story that is by no means over.
News & Media
That is by design.
News & Media
And that is by design.
News & Media
But that is by the by.
News & Media
In most cases, that is by necessity.
News & Media
Best, that is, by English standards.
News & Media
That is by no means guaranteed.
News & Media
Uncharted, that is, by European navigators.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
That is, by big -- and very often secret -- money.
News & Media
Expert writing Tips
Best practice
When using "that is by", ensure the connection between the two parts of the sentence is clear and logical to avoid ambiguity.
Common error
Avoid using "that is by" in simple sentences where a direct explanation would be more concise. For example, instead of "The project succeeded, that is by hard work", write "The project succeeded due to hard work".
Source & Trust
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "that is by" serves as an explanatory connector. It introduces a clarification, method, or means by which something is accomplished, as seen in Ludwig's examples where it links a statement to its specific application or design.
Frequent in
News & Media
69%
Science
19%
Academia
5%
Less common in
Formal & Business
3%
Reference
2%
Wiki
1%
Ludwig's WRAP-UP
In summary, the phrase "that is by" functions as a clear and effective way to introduce an explanation or method. Ludwig AI confirms its grammatical correctness and usability across various contexts, particularly in news, media, and scientific writing. While highly versatile, mindful application, especially avoiding overuse in simple sentences, will ensure clarity and precision in your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
that is achieved through
Highlights the method or process by which something is accomplished.
that is done via
Indicates the means or method used to perform an action.
that is accomplished with
Focuses on the tools or methods used to achieve a specific outcome.
that's according to
Specifies the source or authority for a statement or action.
that is based upon
Emphasizes the foundation or grounds on which something is established.
that's enabled by
Highlights what facilitates or makes something possible.
that results from
Focuses on the cause-and-effect relationship, highlighting the origin of something.
that stems from
Emphasizes the origin or root cause of something.
that is derived from
Highlights the source or origin from which something is obtained.
that is a consequence of
Focuses on the outcome or result of a particular action or event.
FAQs
How can I use "that is by" in a sentence?
You can use "that is by" to introduce an explanation or clarification. For instance, "The problem was solved, "that is by" implementing a new strategy".
What's a more formal alternative to "that is by"?
A more formal alternative could be "that is achieved through" or "that results from", depending on the context.
Is it correct to start a sentence with "that is by"?
Starting a sentence with "that is by" is grammatically incorrect. It's typically used to connect and expand upon a previous clause.
Which is the difference between "that is by" and "that is because"?
"That is by" explains how something is done or achieved, while "that is because" explains the reason why something happened. They serve different explanatory purposes.
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
84%
Authority and reliability
4.5/5
Expert rating
Real-world application tested