The simple present tense: speliing rules with he, she, it:

Add-s to most verbs with he, she, & it
Get-s Make-s Shave-s Comb-s Play-s

Add-es to verbs that end in -s -sh -ch, or -x
Brush-es Watch-es

But remember: do -> does, go -> goes, have -> has, study -> studies