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 if so
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "but if so" is correct and usable in written English.
It is typically used to express doubt or uncertainty. For example, "The tickets said the event started at 7 PM, but if so, why aren't they letting people in yet?".
✓ Grammatically correct
News & Media
Academia
Alternative expressions(20)
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
60 human-written examples
But, if so, then he was mistaken.
News & Media
But, if so, they have compelling implications.
News & Media
But if so, he was outnumbered.
News & Media
But, if so, will anyone notice?
News & Media
But if so, he erred.
News & Media
But if so, how does it work?
Academia
But if so, what number would not?
But if so, I'll tell you.
Academia
But if so, shouldn't they be funny?
News & Media
But if so, who has regressed?
News & Media
But if so, why stop at nudity?
News & Media
Expert writing Tips
Best practice
Use "but if so" to introduce a contrasting idea or potential consequence following a hypothetical situation or assumption. It effectively sets up a contrast while acknowledging the possibility of the initial condition being true.
Common error
Avoid using "but if so" without establishing a clear conditional statement beforehand. Ensure the 'if so' part refers to a previously mentioned possibility or assumption. Without this, the phrase loses its logical connection and can confuse the reader.
Source & Trust
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "but if so" functions as a conjunctive adverbial phrase. It connects two clauses, introducing a contrast or consequence that depends on the condition stated in the preceding clause. Ludwig's examples showcase its role in presenting alternative scenarios.
Frequent in
News & Media
68%
Academia
20%
Science
7%
Less common in
Formal & Business
3%
Encyclopedias
1%
Reference
1%
Ludwig's WRAP-UP
In summary, "but if so" is a versatile conjunctive phrase used to introduce a contrast or consequence contingent on a prior condition. As affirmed by Ludwig AI, the phrase is grammatically sound and suitable for various writing contexts. Its frequency is high across news, academic, and general writing, making it a common and effective way to manage expectations or explore alternative outcomes. While it's important to establish a clear conditional statement beforehand, mastering its usage can enhance the clarity and flow of your writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
on the other hand, if that is accurate
This phrase presents a direct alternative viewpoint, contingent on the accuracy of the prior statement.
conversely, if indeed that is so
This option offers a direct contrast to the initial statement with a slightly more emphatic tone.
however, if that's the case
This alternative provides a more formal tone while retaining the conditional and contrasting elements.
even so, if that holds
This choice highlights that even if something is true, a different outcome may still occur.
yet, assuming that's true
This option adds a sense of surprise or mild contradiction to the conditional statement.
even then, assuming this is valid
This alternative underscores that even with the condition met, something else might happen.
still, granted that's correct
This alternative introduces a concession before presenting a contrasting point.
nonetheless, supposing that's right
This phrase emphasizes the contrast despite the hypothetical condition being true.
despite this, if that remains valid
Emphasizes a sense of something happening regardless of the validity of a prior condition.
that being said, should that be the situation
A more verbose and formal alternative, suitable for academic or professional writing.
FAQs
How can I use "but if so" in a sentence?
Use "but if so" to introduce a contrasting outcome or consequence based on a previous condition. For example, "The weather forecast predicted rain, "but if so", why is the sky so clear?"
What phrases are similar to "but if so"?
Similar phrases include "however if that's the case", "yet assuming that's true", and "conversely if indeed that is so". These alternatives also express a conditional contrast.
Is it grammatically correct to start a sentence with "but if so"?
While starting a sentence with "but if so" is grammatically acceptable, it's crucial that the context is clear and that it refers back to a previous conditional statement. Overuse can make your writing sound fragmented. Consider restructuring for better flow.
What's the difference between "but if so" and "but even if so"?
"But if so" introduces a contrasting outcome given a condition might be true, while "but even if so" emphasizes that the contrast holds despite the condition being true. For example, "I doubt he'll come, "but if so", we'll have enough food. But even if so, there will not be space enough for everyone".
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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
89%
Authority and reliability
4.6/5
Expert rating
Real-world application tested