That is quite a question without knowing the verb. There are -ar, -er, -ir verbs and also irregular verbs that do not follow the "basic" pattern. Here are regular verbs conjugated:
hablar = to speak
yo hablo = I speak, I do speak, I am speaking (usually 3 English translations for each verb form.)
If you have a text book, look in the back for the appendices. You should find both regular and irregular verbs conjugated there for you.
comer = to eat
yo como = I eat, I do eat, I am eatin g
vivir = to live
yo vivo = I live, I do live, I am living
Note that in every case the "yo" form ends in o. That the tú form ends in s. That the ustedes form ends in n. Those are the "markers."
Feel free to post again but please try to make your post as complete as possible!
VIRGIL DUE CON ____A COMER END IN RESTAURANTE ROMANTICO