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 declare
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "must declare" is correct and usable in written English. You can use it when indicating a requirement to announce or state something formally. Example: "All participants must declare their intentions before the deadline." Alternative expressions include "are required to state" and "need to announce."
✓ Grammatically correct
News & Media
Science
Formal & Business
Alternative expressions(20)
have to say
it is mandatory to inform
in my opinion
I should mention
it's worth noting
I'd like to add
I want to point out
have to concede
must acknowledge
reluctantly agree
have to agree
what they have to say
their thoughts
their statement
their position
Inform
it is mandatory to provide
it is important to inform
it is vital to inform
inform me
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
You must declare it.
News & Media
Everyone must declare a loyalty.
News & Media
I must declare an interest.
News & Media
I must declare an interest here.
News & Media
He must declare his decision on Monday.
News & Media
"But a judge must declare as such.
News & Media
And here I must declare an interest.
News & Media
I must declare an interest – I am a lifelong pedestrian.
News & Media
China, he said, must "declare war" on pollution.
News & Media
In Poland, officials must declare whether they were informers.
News & Media
First of all, I must declare a personal interest here.
News & Media
Expert writing Tips
Best practice
When using "must declare" in formal writing, ensure that the context clearly indicates what needs to be declared and the reason for the declaration. This enhances clarity and avoids ambiguity.
Common error
Avoid using "must declare" in overly casual or informal situations where simpler alternatives like "should say" or "need to mention" would be more appropriate.
Source & Trust
88%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "must declare" functions as a modal verb phrase indicating obligation or necessity. As demonstrated by Ludwig, it signifies that someone is required to formally announce or state something, often due to a rule, law, or ethical consideration.
Frequent in
News & Media
60%
Formal & Business
20%
Science
10%
Less common in
Encyclopedias
2%
Wiki
3%
Reference
5%
Ludwig's WRAP-UP
In summary, "must declare" is a grammatically sound and frequently used phrase to express a formal obligation or requirement to announce something. As verified by Ludwig, its usage spans various contexts, with particular prominence in news, business, and scientific domains. When using this phrase, ensure clarity and appropriateness for the intended audience and setting. Consider related phrases like "are required to declare" or "need to announce" for slight variations in tone and emphasis.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
are required to declare
Emphasizes the mandatory nature of the declaration, using a more formal tone.
need to announce
Highlights the necessity of making an announcement, focusing on the act of communicating something.
are obligated to report
Specifically implies a duty to report information, often in a legal or official context.
have to disclose
Focuses on revealing information that might otherwise be hidden, often related to transparency.
should proclaim
Suggests a public and often formal announcement, carrying a sense of importance or significance.
are compelled to state
Indicates that someone is being forced or strongly urged to make a statement.
it is essential to communicate
Highlights the importance of conveying information, often in situations where clarity is crucial.
it is mandatory to inform
Emphasizes the compulsory aspect of providing information, often in regulatory or compliance contexts.
are bound to reveal
Suggests a sense of duty or obligation to uncover or make something known.
it's a prerequisite to specify
Highlights that defining something is a condition that must be fulfilled, suggesting the idea of clarifying information in advance for the purpose of meeting certain requirements.
FAQs
How do I use "must declare" in a sentence?
Use "must declare" to indicate a formal or obligatory announcement. For example, "All participants "are required to declare" any conflicts of interest."
What's a less formal way to say "must declare"?
Alternatives include "need to announce", "should mention", or "have to say" depending on the context.
Is it ever incorrect to use "must declare"?
While grammatically correct, using "must declare" in overly casual conversations can sound stilted. In such cases, consider more informal phrases.
What's the difference between "must declare" and "should declare"?
"Must declare" implies an obligation or requirement, whereas "should declare" suggests a recommendation or advisability. The former is stronger and more mandatory.
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
4.5/5
Expert rating
Real-world application tested