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
i swear that
Grammar usage guide and real-world examplesUSAGE SUMMARY
"I swear that" is a grammatically correct and common phrase in written English.
It is typically used to emphasize the truthfulness or sincerity of a statement or promise. Example: I swear that I will never forget the time we spent together.
✓ 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
59 human-written examples
"I swear that saved me.
News & Media
I swear that victory is soon, and don't be sad.
News & Media
I swear that guy is intolerable.
News & Media
I swear that will work.
News & Media
I swear that Republicans can be their own worst enemy.
News & Media
Amazing to me: I swear that was the essay I skimmed over in reading the book.
News & Media
I swear, that man has been hard on me, ya know it?
News & Media
If you hear Gotye in the background, I swear that is not me jamming Gotye.
News & Media
I swear that Republicans can be their own worst enemy," Republican National Committee member Jevon O.A. Williams wrote.
News & Media
I swear that was my favorite thing to do for years, even with Pokemon being all the rage.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
(I swear that is a word-for-word transcript).
News & Media
Expert writing Tips
Best practice
Use "i swear that" to add emphasis and convey sincerity when you want to assure your audience of the truthfulness of your statement. However, be mindful of the context; overuse can diminish its impact.
Common error
Avoid using "i swear that" too frequently in your writing or speech. Overuse can make you sound less credible and may suggest that you are trying too hard to convince others.
Source & Trust
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "i swear that" functions as a declarative expression, used to emphasize the speaker's sincerity and conviction regarding the statement that follows. It indicates a strong assertion of truth, as evidenced by Ludwig's examples.
Frequent in
News & Media
50%
Science
30%
Academia
20%
Less common in
Formal & Business
0%
Encyclopedias
0%
Wiki
0%
Ludwig's WRAP-UP
"I swear that" is a common phrase used to emphasize the truthfulness of a statement. Grammatically correct, it functions as a declarative expression to convince the listener or reader. While very common, the phrase is generally informal and neutral, making it suitable for everyday conversation and news articles but less appropriate for academic or formal contexts. Ludwig's examples show its prevalence in news and media sources, reinforcing its role in adding emphasis. Be mindful of overuse, as it can diminish credibility. Consider alternatives like "i assure you that" or "i guarantee that" for more formal settings. Ludwig AI confirms that it emphasizes the truthfulness of a statement.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
i assure you that
Replaces 'swear' with a more formal 'assure', emphasizing a guarantee.
i can attest that
Emphasizes personal experience as a basis for the statement.
i guarantee that
Indicates a firm promise or certainty about the statement.
i can confirm that
Suggests verification or validation of the information.
i can verify that
Similar to 'confirm' but emphasizes the ability to prove the statement.
i solemnly declare that
Adds a heightened sense of formality and gravity to the declaration.
i can vouch that
Implies personal endorsement and support for the truth of the statement.
i affirm that
Formally asserts the truth of the statement, often in legal contexts.
i give you my word that
Offers a personal promise as assurance of the statement's truth.
i can promise you that
Directly offers a promise to emphasize the speaker's intent to fulfill the statement.
FAQs
How to use "i swear that" in a sentence?
Use "i swear that" to emphasize the truthfulness of a statement you are making. For example, "I swear that I didn't take the last cookie."
What can I say instead of "i swear that"?
You can use alternatives like "i assure you that", "i guarantee that", or "i can confirm that" depending on the context.
Is using "i swear that" considered formal or informal?
"I swear that" is generally considered informal. For more formal situations, consider using phrases like "I assure you that" or "I attest that".
When is it appropriate to use "i swear that"?
It's appropriate to use "i swear that" when you want to strongly assert the truth of something in a casual setting. Avoid using it in formal or professional contexts.
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
89%
Authority and reliability
4.5/5
Expert rating
Real-world application tested