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Discover LudwigSuggestions(5)
The phrase "are required when" is correct and usable in written English.
It can be used to indicate conditions or situations in which certain actions or items are necessary.
Example: "Safety protocols are required when operating heavy machinery to ensure the well-being of all workers."
Alternatives: "are necessary when" or "must be followed when".
Exact(60)
Normally, psychological exams are required when police officers are hired.
Greater numbers are required when many subindexes are desired.
Patience and negotiation are required when she faces painful procedures or nauseating medications.
Lies are required when trust breaks down, and even casual conversations with strangers can be dangerous.
Such certifications are required when companies seek new contracts or payments under existing contracts.
Traditionally reaction kinetics are required when simulating species decomposition and deposition related processes.
Fast decisions are required when new easily-quantifiable critical information is uncovered.
Gloves are required when handling photographs, film, slides, or metal objects.
A face shield and thick cryogenic gloves are required when working with liquid nitrogen.
In addition, more attractive support schemes are required when the technological level is improved.
Complementary dipole exposures are required when dense pitches in horizontal and vertical direction are present.
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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