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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
which I believed
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "which I believed" is correct and usable in written English.
It can be used to refer to a belief or assumption that the speaker held in the past, often in a context where that belief is being questioned or contrasted with a different perspective. Example: "The evidence presented was contrary to the theory which I believed to be true for many years."
✓ Grammatically correct
News & Media
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
28 human-written examples
He added that a demotion "was a sanction which I believed was fair".
News & Media
At least there was some place within my soul in which I believed that to be so.
News & Media
It was immediately obvious it would have to be cooking, at which I believed I was irredeemably awful.
News & Media
"He then told me that he was an honest and church-going man and that he would not lie, which I believed to be the case".
News & Media
At the station were odd, amputated-looking concrete barricades at track's end, which I believed kept the trains from falling into the streets below.
News & Media
"I knew I had to stay with him, hold my serve and try to wait for my chances, which I believed would come".
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
32 human-written examples
Which I believe it was.
News & Media
Which I believe as well.
News & Media
Which, I believe, is the point.
News & Media
From that, I've generated a list of professions at which I believe I'd excel.
News & Media
I prefer not to use a mechanism which I believe is dubious".
News & Media
Expert writing Tips
Best practice
When using "which I believed", ensure the context clearly indicates that this belief is either no longer held or is being contrasted with current information to provide clarity and avoid confusion.
Common error
Avoid using "which I believed" to introduce essential information. "Which" clauses are nonrestrictive, meaning they add extra detail but aren't crucial to the sentence's meaning. If the belief is essential, consider using "that I believed" or restructuring the sentence.
Source & Trust
94%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "which I believed" functions as a nonrestrictive relative clause, adding extra information about a preceding noun or clause. According to Ludwig AI, this construction is grammatically correct and commonly found in various writing contexts. Examples in Ludwig demonstrate its use to provide context about a previously held opinion or understanding.
Frequent in
News & Media
94%
Science
3%
Formal & Business
3%
Less common in
Academia
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
In summary, the phrase "which I believed" is a grammatically sound and relatively common construction used to provide extra information about a past belief. As Ludwig AI confirms, it serves to add nuance and context to a statement, often implying a shift in perspective. While generally neutral in register, it's important to use "which" clauses correctly—for nonrestrictive information only—to avoid grammatical errors. Alternatives like "that I thought was true" or "that I assumed was correct" can offer subtly different shades of meaning, depending on the intended emphasis.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
that I thought was true
Replaces "believed" with "thought was true", emphasizing a cognitive process rather than a conviction.
that I formerly believed
Emphasizes that the belief is no longer held.
that I assumed was correct
Substitutes "believed" with "assumed was correct", implying a lack of firm evidence.
which I once thought
Uses "once thought" instead of "believed", emphasizing a change in opinion over time.
that I had supposed to be
Uses "supposed to be" instead of "believed", suggesting a tentative or provisional belief.
what I had previously assumed
Combines "previously" and "assumed" to underscore a prior assumption.
what I understood to be
Replaces "believed" with "understood", focusing on comprehension rather than faith.
what I initially considered
Uses "initially considered" implying a reflective process and subsequent reevaluation.
that I had been led to believe
Highlights external influence on the speaker's belief.
what I had taken for granted
Replaces belief with an assumption that was never questioned.
FAQs
How can I use "which I believed" in a sentence?
Use "which I believed" to add extra, non-essential information about something you used to think was true. For instance, "The data contradicted the hypothesis, "which I believed" was unshakeable."
What's a more formal way to say "which I believed"?
In formal writing, you might replace "which I believed" with "that I formerly held to be true" or "that I previously understood to be the case". These options offer a more sophisticated tone but carry the same core meaning.
Is there a difference between "which I believed" and "that I believed"?
"Which I believed" introduces a nonrestrictive clause, adding extra information. "That I believed" introduces a restrictive clause, essential to the sentence's meaning. So, prefer "that" to introduce essential information.
What can I say instead of "which I believed" to sound less assertive?
Alternatives like "which I assumed", "which I presumed", or "which I thought" can be used to convey a less definitive or assertive tone, implying less conviction in the initial belief.
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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
94%
Authority and reliability
4.5/5
Expert rating
Real-world application tested