SIMPLE PRESENT TENSE.

when do we use the simple present tense?
when the action is repeated
what auxiliary verb do we do?  do/does
negative: do not/ does not
          don´t   doesn´t
what happens to the verb? we-add
"s" or "es" to he/she/it in the affirmative structure.
affirmative structure: subject + verb + complement + .
( s/es to he/she,it) the 3rd person singular
rule: when a verb ends in s,sh,ch,o,x,z
add, "es" to the 3rd person singular
rule: when a verb ends in "y" and the previous letter is a consonant change the "y" to "i" and add "es"example:
study
studiesfly-flies
rule: when a verb ends in "y" and the previous letter is a vowel, add "s" to the 3rd person singular
example:
play-plays