Antiepileptic, microorganism or antiarrhythmic do not have a hyphen. Also use hyphens for compound adjectives if it makes them clearer ('a cost-effective treatment' but 'the treatment was cost ...

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A question from Marina in Hong Kong: I am quite confused and cannot understand why the subject of the programme is not '6-minute English' (6-minute as a compound adjective) or '6 Minutes English' (use ...

Carlos Cajina from Nicaragua asks: Compound adjectives can be: 1. Joined by a hyphen 2. Appear as a single word 3. Appear as two separate words. Is there a rule - or set of rules - to know when to use ...