"They are cleaning the rooms today."
Translation:Ellos limpian las habitaciones hoy.
Salas= living rooms habitaciones= rooms dormitorio= bedroom
Sometimes duolingo gives weird/less common words as corrections :)
Verbs ending in -ing are Present Participles. "Ellos limpiando las habitaciones hoy" should be accepted, as well. Correct?
No. Just as one wouldn't say "They cleaning the rooms today" in standard English, one needs to use the verb estar with the participle in Spanish, as seen in GreggSeipp's comment.