Comer means to eat.
  Comer is a regular -er verb.
   To say you were eating or you used to eat,
    use the imperfect ending.

Yo comía cereal cada mañana.
      I used to eat cereal every morning.

Tú no comías ejotes.
      You didn't used to eat green beans.

Pedro comía en ese restaurante todos los
      sábados.
     Pedro used to eat at that restaurant every
      Saturday.

Nosotros comíamos estos camarones asados.
      We used to eat these shrimps roasted.

Vosotros comíais pescado cada viernes.
      You all used to eat fish every Friday.

Ellos comían huevos con jalea.
      They used to eat eggs with jelly.