write the plural form of the countable nouns

1
a ship - ships,a boy- boys, a gun-guns, a day-days
2
a class-classes
a box-boxes
3
army-armies
navy-navies
4
a wolf - wolves
a knife - knives
5
a man-men
a woman-women
a child-children
a foot-feet
a tooth-teeth
an ox-oxen
a goose -geese
a mouse - mice