When do you add ies es at end of a word?

When do you add ies at end of a word 1

When forming the plural of singular words that end in the letter Y, the Y is removed and replaced by IE, followed by the S.

Examples : property / properties -- city / cities -- viscosity / viscosities
If a verb ends with a consonant before -y, we remove the y and add -ies for the third person singular:

I, you, we, they try / he, she, it tries
I, you, we, they cry / he, she, it cries
I, you, we, they fly / he, she, it flies

Read more at http://www.usingenglish.com/articles/spelling-nouns-verbs-ending-y.html#o5AqL03Q8wKlbAL2.99



When do you add es to make a noun plural 2 ?

The ending 'es' is added to words that finish in the following consonant blends:

s, ss, ch, sh, z, zz, x

Some words ending in o need an 'es' rather than 's'.