Plural forms 

Rule :
Add the letter 's'.

Look at this ant please.  There are many ants on the ground.

It's my grammar book.How many grammar books do you have?..I have two grammar books

I have a red car.  Ann has two cars.

Exceptions :

Words ending in Consonant + '-y' => replace the y with '-ies':

party=>parties


Words ending in 's' / 'z', add '-es':

kiss=>kisses
bus=>buses

Words ending in '-f' ou '-fe' : -ves
life => lives

Words ending in -o : -oes (NOT for abréviations: radios, photos).

potato=>potatoes


Words ending in -ch, -tch, -sh => -es

church => churches


Irregular words:

man=>men
woman=>women
mouse=>mice
child=>children


Warning! These words don't change:

One sheep Flock of sheep

One aircraft Two aircraft


Greek or Latin words : the plural form in Greek / Latin

syllabus=> syllabi
criterion=>criteria
hypothesis=>hypotheses
phenomenon=>phenomena
analysis=>analyses
oasis=>oases