When to add an E at the end of a word

Dear sir Madam,
Are there any rules to guide us when to put an E at the end of a word or not to add anything?
I would really appreciate it if you can provide me with an article or a grammar guide on this matter.

Thank you in advance.
Fadi Sawaqed

[mykwyner]

Generally, any noun that ends in the letter O gets an es when it becomes a plural:

potato --- potatoes

There is no rule in English that places an e at the end of a word that doesn't already have one.

As a rule, short words that end in e have a long vowel sound in the previous vowel.

spit ---spite
hat ---hate
Tim --- time
bit ---bite
tun --- tune
hop ---hope