"They see us."
Translation:Ellos nos ven a nosotros.
Can I just say "Ellos nos ven" or "Ellas nos ven" without "a nosotros" at the end?
Yes. It is similar to "me gusta" vs "me gusta a mi", I believe both are acceptable. It's just another layer of clarification that english does not have.
In the propositions "Ellos nos ven a nosotras" should be "Ellos nos ven a nosotros" "Ellas nos ven a nosotros" should be "Ellas nos ven a nosotras"
xebeke: I don't think this is a mistake. I think you are suggesting that the gender of the object pronoun (Nosotras) needs to match the gender of the subject pronoun (Ellos). That is not correct.
Seems like it should work. Maybe duolingo forgot to put it in the database.
in English 9 letters in Spanish 20 I understand now why you have to speak fast in spanish to catch up time....