写出下列名词的复数形式 gun gas cup dog dish class bus play toy holiday

guns,gas,cups,dogs,dishes,classes,buses,plays,toys,holidays,tomatoes,potatoes,zoos,radios
halves,leaves,wives,knives,teeth,men,englishmen,germans,
frenchmen,sheep,chinese,japanese police,news,mice,trousers,ladywriters,tooth-brushes,man teachers,woman doctors,mother-in-laws