"Der Lehrer isst."
Translation:The teacher eats.
"Der Lehrer" or "Die Lehrerin"; "Die Lehrer" is plural of "Der Lehrer" but the verb is singular. "Die Lehrer essen." would be fine.
so could die Frau also mean women (plural)? i.e. you'd have to determine whether die Frau was singular/plural based on context clues? cheers