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 occupied
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "must be occupied" is correct and usable in written English.
It can be used to indicate that a space or position is currently in use or filled by someone or something. Example: "The conference room must be occupied during the meeting, so please find another place to work."
✓ Grammatically correct
News & Media
Science
Academia
Alternative expressions(20)
has to be filled
is in use
is taken
ought to be filled
must be played
must be engaged
must be busy
must be cut
must be prosecuted
must be identified
must be stopped
must be tackled
must be researched
must be eliminated
must be thrilled
must be overturned
must be breached
must be preserved
must be addressed
must be done
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
30 human-written examples
Renters aren't allowed in the program, and the homes must be occupied by the owner.
News & Media
The properties must be occupied by the owners and cannot be used as investments.
News & Media
If the attached substituents bear aromatic rings, then their ortho positions must be occupied by other protecting groups.
Science
Jodl was present on 18th March when Hitler told Raeder all Greece must be occupied before any settlement could be reached.
Academia
"The rule provides that a certain ratio of units within a condominium must be occupied by their owners," Mr. Sherman said, adding that this was mainly because "investor-owned units tend to result in higher rates of foreclosure".
News & Media
(Under the program, the units must be occupied by owners who meet the income requirements). Buyers will also join the homeowners' association and pay a $59 monthly fee to take care of common areas.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
30 human-written examples
We discuss the role of a retail business these days and whether the sole purpose is to deliver shareholder value, something which I venture must be occupying the minds of many retail chief executives just now.
News & Media
This difficulty can be overcome if we think of the receptacle as filled space.[16] As space, its role is to provide both three-dimensional extension and a specific location for any observable particular to be "in" at a given time: for any particular to be, it must be occupy some spatial location (52b3 5), though not necessarily the same one throughout.
Science
The property must also be occupied as a primary residence.
News & Media
Instead, the Cdc12 pocket must not be occupied by a nucleoside triphosphate, i.e., GTP or CTP.
Science
Thus, 14 monoanionic ligands are necessary to balance the charges of the Ln2Ti4O4 core, and 28 coordination sites must still be occupied.
Expert writing Tips
Best practice
When using "must be occupied" in formal writing, ensure the context clearly establishes the reason why the occupancy is necessary or obligatory. This adds precision to your statement.
Common error
Avoid using "must be occupied" in casual conversation where simpler alternatives like "is in use" or "is taken" would sound more natural. Formal language can sometimes seem stilted in informal settings.
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "must be occupied" primarily functions as a passive verb phrase expressing necessity or obligation for a subject to be in a state of being filled or inhabited. It’s used to convey a mandatory requirement, as illustrated by Ludwig's examples, where positions, spaces, or roles need to be filled.
Frequent in
News & Media
34%
Science
33%
Academia
17%
Less common in
Wiki
7%
Formal & Business
5%
Encyclopedias
4%
Ludwig's WRAP-UP
In summary, the phrase "must be occupied" is a passive verb phrase indicating a requirement or necessity for something to be filled or inhabited. According to Ludwig, the phrase is grammatically correct and commonly used across various contexts, particularly in news, science, and academia. While versatile, it leans towards formal and technical registers, making it suitable for formal writing, legal documents, or precise instructions. For more casual communication, simpler alternatives like "is in use" or "is taken" may be more appropriate.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
has to be filled
Emphasizes obligation for something to be filled.
needs to be taken
Highlights the necessity of occupation or possession.
is required to be inhabited
Stresses the mandatory nature of being lived in.
is essential to be tenanted
Focuses on the vital aspect of having a tenant.
should be inhabited
Suggests a recommendation or expectation that it is lived in.
ought to be filled
Implies a moral or practical obligation to be filled.
is mandated to be filled
Highlights a legal or formal requirement to be filled.
is compelled to be inhabited
Emphasizes that it is forced or obliged to be lived in.
is obliged to be inhabited
Focuses on a duty or responsibility to be lived in.
has a requirement to be filled
Highlights the condition or stipulation to be filled.
FAQs
How can I use "must be occupied" in a sentence?
The phrase "must be occupied" is used to indicate that a space, position, or role is required to be filled or currently in use. For example, "All seats during the performance must be occupied" or "The position of the director must be occupied by a qualified individual".
What are some alternatives to "must be occupied"?
Depending on the context, you can use alternatives such as "has to be filled", "needs to be taken", or "is required to be inhabited".
Is it correct to say "should be occupied" instead of "must be occupied"?
While both phrases are grammatically correct, "must be occupied" indicates a stronger obligation or necessity than "should be occupied". "Should" suggests a recommendation, whereas "must" implies a requirement.
When is it appropriate to use "must be occupied" in writing?
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
82%
Authority and reliability
4.5/5
Expert rating
Real-world application tested