To form the Present Simple Tensewe use the verb's base form (go, work,speak, study). In 3^rd person singular (he, she, it), the base form of the verb takes -s/es. (Auxiliary verbs "be," "do," "have", which can also be used as main verbs, are exceptions.)

 Affirmative form 

I

you                 work

we     

they

he/she/it     works /-s/

go - goes /-es/

watch - watches /-es/

play - plays /-s/

study - studies /-es/

 Negative form

I
you      DO NOT /don't/
we           WORK
they

he/she/it    DOES NOT
              /doesn't / WORK

1. She doesn't often go to the cinema.
2. I don't get up early at the weekend.
3. They don't speak English very well.

 Interrogative form

               I
DO       you       WORK?
             we
             they

DOES   he/she/it    WORK?