Brazilian Portuguese Grammar

prefix	noun	The second element goes to the plural.
o co-autor => os co-autores *the co-author => the co-authors* a ex-mulher => as ex-mulheres *the ex-wife => the ex-wives* o auto-retrato =>os auto-retratos *the self-portrait => the self-portraits*
adjective	adjective	The second element goes to the plural.
o social-democrata => os social-democratas *the Social Democrat => the Social Democrats* o anglo-saxão => os anglo-saxões *the Anglo-Saxon => the Anglo-Saxons*
adverb	noun, verb or adjective	The second element goes to the plural
o abaixo-assinado => os abaixo-assinados *the petition => the petitions* o alto-falante => os alto-falantes *the loudspeaker => the loudspeakers*