Rules on how to change singular nouns into their plural forms

This time I'll be sharing with you the simple steps on how to change singular nouns into their plural forms. This so called rules have been used until now, though there are a few additions, which I will also be mentioning below.

Rule #1

Simply add 's' to some singular nouns. Remember, it's only for some nouns, not all.

jail-jails

book-books

Rule#2

Add 'es' to nouns ending with a sibilant sound such as s, sh, ch, x or z. Sibilant sound is just like the sound of a whisper.

church-churches

box-boxes
dish-dishes

But the plural form of the noun bus can be written as buses or busses.