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
crystal must
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "crystal must" is not correct and does not convey a clear meaning in written English.
It seems to be an incomplete expression and lacks context for proper usage. Example: "In this situation, the crystal must be handled with care to avoid damage."
⚠ May contain grammatical issues
Science
News & Media
Encyclopedias
Alternative expressions(2)
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
18 human-written examples
Crystal must have a Zen moment.
News & Media
Crystal must have been seeking punishment, humiliation, shame.
News & Media
Nevertheless, Crystal must be right in saying that children will learn spelling more easily if they understand contexts and etymologies.
News & Media
Nevertheless, Crystal must be right in saying that children will learn spelling more easily if they understand contexts and etymologies.
News & Media
When such a crystal is to be dissolved, the attraction of the oppositely charged ions, which are largely responsible for cohesion in the crystal, must be overcome by electric charges in the solvent.
Encyclopedias
Aside from the false nature of her domestic situation, Crystal must also hide the dispiriting news she has just received: that her new job selling Saturns will soon be going away when the dealership closes.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
42 human-written examples
The highly compressible and fragile nature of the crystals must be explicitly factored into any design of protein crystallization equipment.
This makes them, as this University of California at Berkeley webpage put it, "nearly perfect clocks". Any lead that scientists find in the crystals must come from radioactive decay.
News & Media
Steno was able to show by this reasoning that fossils and crystals must have solidified before the host rock that contains them was formed.
The liquids have to be kept at freezing point when they are mixed and the TATP crystals must be dried before being ignited, a process which could take several hours.
News & Media
However, they may also be stored in another room, such as the cold room or the chemistry lab, if necessary (e.g. if crystals must be mounted in the cold or if they are being used at the A-1 station).
Academia
Expert writing Tips
Best practice
When intending to convey necessity related to a crystal, ensure that the sentence structure clearly articulates what is required or essential about the crystal. For example, instead of saying "crystal must", specify what the crystal must do or be, such as "the crystal must be centered".
Common error
Avoid using the phrase "crystal must" in isolation. It lacks the necessary context to convey a clear meaning. Always specify the action or state that the crystal is required to perform or possess, providing a complete and understandable sentence.
Source & Trust
82%
Authority and reliability
2.8/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "crystal must" by itself, is incomplete and requires additional context to form a grammatically correct sentence. Ludwig AI confirms that it is not correct without further elaboration. It typically functions as the beginning of a statement of necessity or requirement.
Frequent in
Science
50%
News & Media
30%
Encyclopedias
20%
Less common in
Wiki
0%
Formal & Business
0%
Reference
0%
Ludwig's WRAP-UP
In summary, the phrase "crystal must" requires careful handling to ensure grammatical correctness and clarity. According to Ludwig AI, the phrase, by itself, is not correct. While examples exist across scientific literature, news, and general knowledge sources, its usage should be expanded to specify the requirement, condition, or action associated with the crystal. Given that the phrase by itself can come off as incorrect, writers should opt for more specific constructions such as "the crystal must be" or "the crystal must have" to clearly convey the intended meaning. By using precise language, communicators can avoid ambiguity and ensure their message is accurately understood.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
it absolutely must
Emphasizes the absolute necessity.
it definitely must
Highlights the definiteness of the necessity.
clearly must
Adds an adverb to emphasize the necessity.
the crystal has to
Expresses obligation using "has to".
must be crystalline
Reverses the order and specifies the state of being crystalline.
crystal is required
Replaces "must" with "is required" to denote necessity.
the crystal needs to
Expresses necessity using "needs to".
it must be crystal clear
Emphasizes clarity and certainty.
crystal is necessary
Replaces "must" with "is necessary" to indicate necessity.
the crystal is essential
Emphasizes that the crystal is fundamentally important.
FAQs
How can I use the word "crystal" with "must" in a sentence?
To properly use "crystal" with "must", ensure you specify what the crystal is required to do or be. For instance, "the crystal structure must be verified" or "the crystal must be kept at a low temperature" provides a clear meaning.
What's a better way to say "crystal must"?
Instead of "crystal must", try alternatives such as "the crystal is required", "the crystal needs to", or "the crystal has to", depending on the context. For instance, "the crystal is required" for diffraction analysis.
Is it grammatically correct to say "crystal must"?
The phrase "crystal must" is generally considered grammatically incomplete. It lacks a verb or further context to make it a complete thought. Better alternatives include "the crystal must be" or "the crystal must have".
What does "crystal must" imply in scientific writing?
In scientific writing, "crystal must" is imprecise and should be avoided. Clearly state the necessary condition or property of the crystal, such as "the crystal must diffract X-rays" or "the crystal must be free of defects".
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
82%
Authority and reliability
2.8/5
Expert rating
Real-world application tested