in the present simple only with he she it

i think that we can add the s in the present with he/she or it

present simple statements((not questions or negatives sentences)) which their sentences start with the 3rd person singular (he, she, it), or a singuler noun or name we add s to the main verb or es . We have to follow certain spelling rules in order to use "-s" or "-es". If the verb ends in "-ch, -sh, -ss, -x or -o" we will add "-es". He sings well. She likes to dance. It moves very quietly. Susan enjoys cooking. Mark goes to school by bus. Simon brushes his teeth after every meal. She goes to the bank every Tuesday. He sometimes goes to the park. Wendy often listens to the radio.

you should study everywhere,at home at work at school and you can add:)