Most of them. Ones which end in F (most of the time) get rid of the F and put in a ves. e.g leaf-leaves. Some just end in s. e.g clock-clocks. Some add an es. e.g Sandwich- Sandwiches. Some get rid of the end of the word and add an i. e.g cactus-cacti.
what are the greek words end by 'on' in singular and change to 'a' in plural?
Words that are plural mean there are more than 1 of something. Some words that are meant to be plural don't change like the word, "moose."
There is no plural form. Do and Do not are verbs
Nouns that remain the same in the singular and the plural are:bisoncattledeersheepspecies
The plural of infirmity is infirmities. For most words ending in y, change it to i and add es.
Many of them change to -ies for the plural.
Some examples of words that change in the plural form are:man, mengoose, geesemouse, micetooth, teethaxis, axesperson, peoplemedium, mediafoot, feettooth, teethchild, childrencrisis, crisescherub, cherubim
To make words ending in "is" plural, change "is" to "es" at the end of the word. For example, "analysis" becomes "analyses," and "thesis" becomes "theses."
The plural of loaf is loaves. Some, but not all words ending in F change it to a V and add -es to form the plural (thief-thieves, hoof-hooves).
The plural of change is changes.
Words like candy, bully, spy, pony... when the word has a consonant before the final y, then change the y to ies to form the plural.
Some words end in a consonant + y. To make them plural, change y to i and add es. Candy -> Candies