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
Must be afraid
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "Must be afraid" is correct and usable in written English.
It can be used when expressing a belief or assumption about someone's emotional state, particularly fear. Example: "After hearing the news, she must be afraid of what might happen next."
✓ Grammatically correct
News & Media
Alternative expressions(3)
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
9 human-written examples
For there to be a war between us, first we must be afraid of each other, we must hate.
News & Media
He was still hovering over her with his gun, and it occurred to her that he must be afraid.
News & Media
And a spokesman for the Republican National Committee, Trent Duffy, said, "Jim McGreevey must be afraid of a fair fight, so he's running to court to block New Jerseyans from hearing the truth about his retread record".
News & Media
Because when you are jailing an ailing 62-year-old democracy scholar from the American University in Cairo, whose biggest sin was that he was working to give some real meaning to Egypt's parliamentary elections, you really must be afraid of your own people and you really must want to terrify every other potential democracy advocate in your society.
News & Media
Rahm must be afraid of democracy.
News & Media
It seems as if we must be afraid of life, itself, afraid of the human experience.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
51 human-written examples
Finally, hotels, off-licences, taxi firms, takeaways, bouncers, and indeed all of us, must be more alert to suspicious behaviour and must not be afraid to speak up.
News & Media
While the diagnostician must not be afraid to find something novel, the finding must be real.
Science
We must build on recent successes and in doing so must not be afraid to learn the lessons from what we could have done better.
News & Media
But, for those moments of silence to work, the playwright must be attuned to what it is that his characters aren't saying, and he must not be afraid of damaging the play's pacing or diffusing the plot.
News & Media
We must not be afraid.
News & Media
Expert writing Tips
Best practice
Use "must be afraid" when you want to express a logical deduction or strong belief about someone's state of fear, based on the available evidence or context. It indicates a high degree of certainty.
Common error
Avoid using "must be afraid" to merely suggest a possibility of someone being afraid. "Might be afraid" or "could be afraid" are more appropriate when expressing uncertainty.
Source & Trust
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "must be afraid" functions as an epistemic modal phrase, expressing a strong inference or logical deduction about someone's emotional state. This is based on available evidence or context, similar to examples provided by Ludwig.
Frequent in
News & Media
100%
Less common in
Science
0%
Formal & Business
0%
Ludwig's WRAP-UP
In summary, the phrase "must be afraid" is a grammatically correct and usable English phrase that expresses a strong inference or logical deduction about someone's state of fear. Ludwig AI confirms its acceptability. While not extremely common, it appears primarily in News & Media contexts. When using this phrase, ensure you are conveying a sense of strong belief based on available evidence, and avoid using it when simply suggesting a possibility. Alternatives like "must be scared" or "must be frightened" can offer slightly different nuances. Remember that, as underlined by Ludwig, this structure implies certainty, not just possibility.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
must be scared
Replaces "afraid" with "scared", a more informal synonym.
must be frightened
Replaces "afraid" with "frightened", suggesting a higher degree of fear.
must feel fear
Emphasizes the feeling of fear directly.
must be apprehensive
Uses "apprehensive" to convey a sense of anxiety or unease.
must be worried
Focuses on the worry or concern aspect of fear.
must be anxious
Highlights the anxiety associated with the situation.
must be terrified
Indicates a very intense level of fear.
must be in fear
Rephrases to emphasize the state of being in fear.
must be dreading
Focuses on the anticipation of something frightening.
must be panicking
Suggests a state of uncontrolled fear and anxiety.
FAQs
What does "must be afraid" imply?
The phrase "must be afraid" suggests a strong deduction or logical conclusion that someone is experiencing fear, based on the circumstances.
When is it appropriate to use "must be afraid" in a sentence?
Use "must be afraid" when you have good reason to believe, based on the context, that someone is feeling fear. It's stronger than saying they might or could be afraid.
What are some alternatives to "must be afraid"?
You can use alternatives like "must be scared", "must be frightened", or "must feel fear" depending on the context and level of formality.
How does "must be afraid" differ from "might be afraid"?
"Must be afraid" indicates a higher degree of certainty and logical deduction, while "might be afraid" suggests a possibility or uncertainty about someone's fear.
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
87%
Authority and reliability
4.1/5
Expert rating
Real-world application tested