In Spanish, verb endings are very important as they show who is doing something. Most of them follow regular patterns.
The ending for yo, I, is -o
tomar: tomo
No tomo café.
I don't drink coffee.
comer: como
Como tostadas con mermelada.
I eat toast and jam.
The ending for tú, you, is -as or -es.
The infinitive, or dictionary form, tells you what the pattern will be.
For verbs ending in -ar, like tomar, the ending is -as:
tomar: tomas
¿Tomas vino?
Do you drink wine?
For verbs ending in -er or -ir, like comer and vivirto live, the ending is -es: