Simple present

In present simple, the verb changes only in third person singular (he, she, it, a person, a thing), we usually add -s 

Examples:

run -> Emily runs every day

live -> Carlos lives in Santiago

The -es suffix is used when the verb ends in the letters ss, sh, ch, x or z.

Examples:

catch -> Sam catches butterflies

Fix -> Sarah fixes the car

When the base form ends in consonant + y, we change y to i and then add -es

Examples:

Study -> She studies

Worry -> He worries

/S/ /Z/ /IZ/

We use /S/ for words that end in an unvoiced consonant

likes, stops, laughs, sports, baths

We use /Z/ for words that end in a voiced consonant

dogs, words, loves, dreams, sings

We use /Z/ for words that end in a vowel

plays, trees, toes

We use /IZ/ for words with - es ending