18 Unit 3 l’arbitro  [ms]  frances e gli arbitri  [mp]  frances i la cameriera  [fs]  frances e le cameriere  [fp]  frances i lo stadio  [ms]  grand e gli stadi  [mp]  grand i la casa  [fs]  grand e le case  [fp]  grand i the French referee the French referees the French waitress the French waitresses the big stadium the big stadia/stadiums the big house the big houses ottimista paci fi sta belga entusiasta idiota optimistic paci fi st Belgian enthusiastic idiotic il corteo  [ms]  paci fi st a l’idea  [fs]  paci fi st a i cortei  [mp]  paci fi st i le idee  [fp]  paci fi st e il ragazzo  [ms]  belg a la ragazza  [fs]  belg a i ragazzi  [mp]  belg i le ragazze  [fp]  belgh e * the paci fi st rally the paci fi st idea the paci fi st rallies the paci fi st ideas the Belgian boy the Belgian girl the Belgian boys the Belgian girls il vestito rosa la penna blu i numeri dispari le pagine pari the pink garment/dress/suit the blue pen the odd numbers the even pages 6 Care is needed in spelling the plural of adjectives ending in  -co  and  -go . There is no  fi xed rule for the masculine forms, which may keep the hard 5 There are also some invariable adjectives, e.g.  blu  (dark blue),  rosa  (pink), dispari  (odd),  pari  (even), which do not change. * For an explanation of the  -h-  in  belghe , see paragraph 6 below. These adjectives have three forms:  -a  for the masculine and feminine singular ( ottimist a ),  -i  for the masculine plural ( ottimist i ) and  -e  for the feminine plural ( ottimist e ). There is thus only one form for the masculine and feminine singular: 4 Some adjectives end in  -a , like the following: