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
he must
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase 'he must' is correct and usable in written English.
You can use this phrase in any context where you are expressing an obligation or requirement, or a logical conclusion. For example: "He must have left early to avoid the traffic."
✓ 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
He must.
News & Media
He must be scared.
News & Media
"He must leave.
News & Media
He must have.
News & Media
And he must.
News & Media
He must find one.
News & Media
"He must be prosecuted.
News & Media
"He must be confused.
News & Media
He must know me".
News & Media
He must attack.
News & Media
He must be moral.
News & Media
Expert writing Tips
Best practice
Use "he must" to clearly convey obligation or logical deduction. Ensure the context provides sufficient basis for the conclusion or necessity you are expressing.
Common error
Avoid using "he must" when a weaker suggestion like "he should" or "he could" is more appropriate. Overusing "he must" can make your writing sound overly assertive or presumptuous.
Source & Trust
87%
Authority and reliability
4.6/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "he must" functions primarily as a modal verb phrase. It combines the third-person singular pronoun "he" with the modal verb "must" to express obligation, necessity, or a strong logical inference. As Ludwig AI confirms, this phrase is grammatically correct and widely applicable.
Frequent in
News & Media
70%
Science
15%
Formal & Business
5%
Less common in
Encyclopedias
3%
Wiki
2%
Reference
5%
Ludwig's WRAP-UP
In summary, the phrase "he must" is a versatile modal verb phrase used to express obligation, necessity, or strong logical deduction. As Ludwig AI indicates, it is grammatically correct and widely used. Its frequency and presence in authoritative sources like The New York Times, BBC, and The Economist demonstrate its prevalence across various contexts. While generally neutral in register, it's important to avoid overusing it in situations where a weaker suggestion is more appropriate. Remember to use it to express certainty or obligation, and consider alternative phrases to soften your tone when needed.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
He has to
A more informal way of expressing necessity or obligation.
He needs to
Indicates a requirement or necessity, often less forceful than "must".
It is imperative that he
Emphasizes the critical necessity of his action.
It is essential for him to
Emphasizes the importance of his action.
He is obliged to
Highlights a formal or moral requirement.
He is required to
Suggests a rule or regulation that he has to follow.
He should
Expresses a recommendation or expectation, weaker than "must".
It is his duty to
Implies a moral or professional obligation.
Presumably, he
Indicates a logical conclusion based on available evidence, rather than obligation.
I presume he
Indicates a logical conclusion or assumption made by the speaker.
FAQs
How can I use "he must" in a sentence?
Use "he must" to express obligation (e.g., "He must complete the task by Friday") or a strong inference (e.g., "He must be tired after working all day").
What is a less forceful alternative to "he must"?
If you want to suggest something without imposing a strict obligation, you can use alternatives like "he should" or "he ought to".
How does "he must" differ from "he might"?
"He must" indicates a high degree of certainty or obligation, while "he might" suggests possibility or uncertainty. The phrase "he might" express possibility and indicate uncertainty.
When is it appropriate to use "he must have"?
"He must have" is used to make a logical deduction about a past event. For example, "He must have left already, since his car is gone".
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
4.6/5
Expert rating
Real-world application tested