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Only when it's being used as an adjective. If one says "These requests will be evaluated on a case-by-case basis," there should be hyphenation.
However, if the phrase is used as a noun or an adverb, it will not have hyphenation, like so: "We will review these requests case by case."
Basically, if it's modifying, or affecting the meaning of, a noun, it should be hyphenated. If it's affecting a verb (in the second case, HOW reviewing is done), then it need not be hyphenated.
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∙ 12y ago
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Is postoperative hyphenated or not?
It is not hyphenated.
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No it's not hyphenated.
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Motorcycle is not hyphenated
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words are only hyphenated when they have a separate meaning when separated than they do when hyphenated
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No, "hardworking" is not hyphenated.
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Yes it should be hyphenated.
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It can be. Some words can be seen both hyphenated and non-hyphenated.
Is built-in a hyphenated word?
Yes it should be hyphenated.
Where the word desperate can be hyphenated?
The word desperate hyphenated
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No it shouldn't be hyphenated.
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All-consuming is hyphenated
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"Field" is not hyphenated.
