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(a) Hyphenate adjective-plus-noun and participle-plus-noun compounds modifying another noun, when ambiguity might otherwise result:
When the compound is used predicatively, retain the hyphen only when the expression remains adjectival:
but
(b) Hyphenate compound adjectives made up of two adjectives that describe a colour without the suffix ish, whether they are placed before or after the noun. Hyphenate compounds with the suffix only when they precede the noun:
Do not hyphenate adjectives indicating a specific shade (even if they precede the noun):
(c) Hyphenate adjective-plus-participle compounds, whether used before the noun or after it:
(d) Hyphenate compounds made up of an adjective plus a noun to which the ending ed has been added, in any position in the sentence:
(e) Hyphenate two-word compound adjectives consisting of a noun plus a gerund when they precede the noun:
See also 2.03 Nouns with adjectives and participles(c).
(f) Hyphenate compound adjectives whose final constituent is an adverb of direction or place (in, out, down, up, etc.) when they precede the noun:
(g) Hyphenate compound adjectives made up of a preposition and a noun:
(h) Hyphenate a compound adjective one of whose constituents is a finite verb:
(i) Hyphenate phrases of more than two words, at least one of which is an adverb or preposition, used as attributive adjectives:
(j) Do not hyphenate French or foreign words used as adjectives or in italics, proper nouns used as adjectives, or words in quotation marks:
Note that this rule does not apply to French or foreign words no longer considered as such:
(k) Do not hyphenate chemical terms used as adjectives:
(l) Hyphenate compound proper adjectives that form a true compound, but do not hyphenate those in which a proper adjective is combined with a simple modifier:
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