By adding -es to nouns ending in –ch, -s, -sh, -ss, -x, and -z.

 

 

 

Singular  Plural    Singular  Plural 
address addresses   fish fishes
batch batches   inch inches
beach beaches   itch itches
boss bosses   kiss kisses
box boxes   lens lenses
branch branches   lunch lunches
brush brushes   match matches
bus buses   minus minuses
buzz buzzes   patch patches
catch catches   peach peaches
church churches   plus pluses
class classes   prefix prefixes
clutch clutches   prospectus prospectuses
coach coaches   quiz quizzes
complex complexes   six sixes
cross crosses   slash slashes
dish dishes   speech speeches
dress dresses   suffix suffixes
eyelash eyelashes   tax taxes
flash flashes   thrush  thrushes 
fox foxes   virus viruses
gas gases   watch watches
glass glasses   wish wishes