Number

To change a singular number word into a plural number word ,there are some other rules.They are:-

4).If a singular number word ends with "-f/fe","-v" will be placed instead of "-f/fe" and "-es" will be added after "-v" in plural number.i.e.

singular.........plural

leaf---------leaves

calf--------calves

loaf--------loaves

wife-------wives

There are some exceptions also.i.e.

singular.........plural

roof---------roofs

cliff---------cliffs

chief-------chiefs

reef---------reefs

The following singular words are changed in plural form using both the ways.i.e.

singular.........plural

hoof-------hoofs/hooves

wharf-----wharfs/wharves

scarf------scarfs/scarves

staff------staves

5).If a singular number word ends with "-o" and there is a consonant before it,"-es" will be added after that"-o" in plural number.i.e.

singular.........plural

hero--------heroes

potato-----potatoes

mango----mangoes

Exception:- If any singular number word ends with "-o" and there is a vowel before it,"-s" will be added after that"-o" in plural number.i.e.  

singular.........plural

studio------studios

cuckoo----cuckoos

bamboo---bamboos

But there are some rare exception also.i.e.

singular.........plural

photo------photos

radio------radios

piano-----pianos

canto----cantos

The following singular words are changed in plural form using both the ways.i.e.

singular.........plural

portico---porticos/porticoes

calico----calicos/calicoes

mosquito---mosquitos/mosquitoes