"The women eat a fish sandwich."
Translation:Las mujeres comen emparedado de pescado.
When you are in the present indicative tense, which is the tense Duolingo is using for this exercise, the verb 'comer' is conjugated as 'comen' when you are referring to the third person plural (ex: They eat = Ellos comen/Ellas comen/Ustedes comen). 'Comer' is conjugated as 'comes' when you are referring to the second person singular (ex: You eat = Tú comes/Usted comes). Hope that helps!