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When is it appropriate to use a hyphen?

In phrases describing something that has been assigned to someone, should the phrase be hyphenated or not?

He uses a company-assigned phone number.


He uses a company assigned phone number.

What is the rule for similar phrases?


1 Answer 1


If the sentence is made clearer by the hyphenation, then it's a good idea.

In a case where you use several adjectives, it may help to identify which are being 'combined'.

For example 'use three two digit numbers' is a little clearer as 'use three two-digit numbers'

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