5. Present simple, third person
Present simple is used when talking about a regularly occurring action, something that is general knowledge or an unchanging condition:
I walk to work on Mondays.
Some people put milk in their tea.
The sun is brighter than the moon
In present simple, the verb changes only in third person singular (he, she, it, a person, a thing), where it gets the suffix -s or -es:
run -> Emily runs
catch -> Sam catches butterflies
The -es suffix is used when the verb ends in the letters ss, sh, ch, x or z:
misses, not misss
fixes, not fixs