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
doubts that
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "doubts that" is correct and can be used in written English.
It is typically used to introduce a clause which expresses a lack of certainty or confidence in something. For example: "John doubts that he will ever find the courage to ask his crush on a date."
✓ Grammatically correct
News & Media
Science
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
One doubts that.
News & Media
Nobody doubts that.
News & Media
No economist doubts that.
News & Media
Ms Sawhill doubts that would work.
News & Media
But Mrs. Mobley doubts that.
News & Media
There are serious doubts that will fly.
News & Media
Sikatari, the foreman who did not protest, doubts that.
News & Media
Any doubts that China is Apple's next target?
News & Media
But Olshansky doubts that will happen anytime soon.
Science & Research
One doubts that will occur.
News & Media
"We were becoming Venezuela — nobody doubts that.
News & Media
Expert writing Tips
Best practice
Use "doubts that" to introduce a clause expressing uncertainty, ensuring the following clause is grammatically complete and logically sound.
Common error
Avoid using "doubt if" in formal writing. While sometimes used colloquially, "doubts that" is the grammatically correct and preferred construction for expressing uncertainty in most contexts.
Source & Trust
88%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "doubts that" functions as a connector introducing a subordinate clause expressing uncertainty or disbelief. It indicates that the subject of the main clause has reservations about the truth or validity of the statement in the subordinate clause. Ludwig provides examples of this usage in various contexts.
Frequent in
News & Media
50%
Science
33%
Formal & Business
17%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "doubts that" is a grammatically correct and frequently used expression to introduce uncertainty or disbelief. As Ludwig AI confirms, it's suitable for various writing contexts, particularly in news, science, and business. While alternatives like "suspects that" or "questions whether" exist, "doubts that" provides a clear and direct way to express skepticism. Remember to use "doubts that" rather than the informal "doubt if" for more formal writing.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
suspects that
Expresses a similar lack of certainty, but often implies a stronger degree of suspicion.
questions whether
Focuses on the act of questioning the truth or validity of something.
is skeptical that
Highlights a general attitude of doubt or disbelief.
has reservations about
Indicates a feeling of unease or hesitation about something.
is unconvinced that
Emphasizes a lack of persuasion or belief.
finds it hard to believe that
Expresses difficulty in accepting something as true.
is dubious that
Suggests a strong feeling of doubt or suspicion.
is uncertain whether
Highlights a lack of clarity or confidence.
has suspicions that
Implies a belief that something is wrong or dishonest.
hesitates to accept that
Indicates a reluctance to agree or believe something.
FAQs
How can I use "doubts that" in a sentence?
You can use "doubts that" to introduce a clause expressing a lack of certainty or belief. For example, "He doubts that the project will be completed on time."
What are some alternatives to "doubts that"?
Alternatives include "suspects that", "questions whether", or "is skeptical that", depending on the specific nuance you want to convey.
Is it correct to say "doubt if" instead of "doubts that"?
While "doubt if" is sometimes used informally, "doubts that" is generally considered the grammatically correct and more formal option.
What is the difference between "doubts that" and "believes that"?
"Doubts that" expresses a lack of certainty or belief, while "believes that" expresses confidence or conviction.
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
4.1/5
Expert rating
Real-world application tested