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
but when
Grammar usage guide and real-world examplesUSAGE SUMMARY
"but when" is correct and usable in written English.
You can use it to introduce a time when something happens in contrast to another time. For example: "I enjoy getting up early, but when I have a lot of work to do, I'll stay up late."
✓ Grammatically correct
News & Media
Wiki
Encyclopedias
Alternative expressions(9)
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
Use "but" when addressing their wishes.
Wiki
But when losses abound?
News & Media
But when was this?
News & Media
But when I count?
News & Media
"But when the towers fell".
News & Media
But when I think harder. . .
News & Media
But when in the winter?
News & Media
It's not if, but when".
News & Media
But when had it happened?
News & Media
But when did it start?
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
Surely-but when?
News & Media
Expert writing Tips
Best practice
Use "but when" to introduce a contrasting situation linked to a specific point in time. This helps to create nuance and complexity in your writing.
Common error
Avoid using "but when" to connect two simple sentences where a single conjunction like "but" or "and" would suffice. Overuse can make your writing sound convoluted.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "but when" functions as a conjunction, introducing a contrasting element that is specifically tied to a point in time. According to Ludwig AI, it is used to introduce a time when something happens, contrasting with another time.
Frequent in
News & Media
75%
Wiki
10%
Encyclopedias
5%
Less common in
Formal & Business
3%
Science
3%
Reference
2%
Ludwig's WRAP-UP
In summary, the phrase "but when" serves as a conjunction introducing a temporal contrast. Ludwig AI validates its grammatical correctness and usability. It is commonly found in News & Media, Wiki, and Encyclopedias. While versatile, avoid overuse in simple sentences to maintain clarity. Related phrases like "yet when" and "however when" offer alternatives, and understanding its function prevents common errors. Remember, use "but when" to add depth to your writing by specifying contrasting circumstances tied to time.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
yet when
Replaces "but" with "yet", emphasizing a contrast or concession related to time.
however when
Substitutes "but" with "however", providing a more formal contrast about timing.
although when
Replaces "but" with "although", introducing a subordinate clause indicating a contrast in time or circumstance.
though when
Similar to "although when", but less formal.
conversely when
Replaces "but" with "conversely", offering a stronger contrast related to a specific time.
on the other hand when
Offers a contrasting viewpoint related to a specific time.
in contrast when
Highlights a direct opposition related to time.
while when
Introduces a clause indicating something happening at the same time with a contrast.
whereas when
Replaces "but" with "whereas", highlighting a difference between two times or situations.
even so when
Indicates a contrast despite what has just been mentioned related to a time.
FAQs
How can I effectively use "but when" in a sentence?
Use "but when" to introduce a situation that contrasts with a previous statement, specifically focusing on a temporal aspect. For example, "I enjoy exercising daily, but when it rains, I prefer to stay indoors."
What are some alternatives to using "but when"?
Depending on the context, you can use alternatives such as "yet when", "however when", or "although when" to convey a similar meaning.
Is it grammatically correct to start a sentence with "but when"?
While grammatically permissible, starting a sentence with "but when" can sometimes sound informal. Consider rephrasing for a more formal tone, or ensuring the contrast is clear.
What is the difference between "but when" and "and when"?
"But when" introduces a contrast related to a specific time, whereas "and when" introduces an additional event occurring at a specific time, without necessarily implying a contrast.
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
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested