Nouns and plurals

Most nouns form their plural by adding '-s'.
chair, chairs
plate, plates

Nouns which end in '-s', '-ss', '-ch', '-x', and '-z', make their plurals by adding '-es'
mass, masses
match, matches

Nouns which end in a consonant (e.g. m, t, p) + '-y', form their plurals by taking away the '-y' and adding '-ies'
baby, babies
university, universities

Some nouns which end in '-f'or '-fe' form their plurals by taking away the '-f/-fe' and adding '-ves'
wife,wives
thief,thieves

There are some irregular plurals
man,men
woman,women
mouse,mice
child,children