"Your sister sees you."
Translation:Ваша сестра видит вас.
Can ты and the derived word forms be used here? I put твоя сестра тебя видит and it was marked wrong.
your answer is right. report it. Actually the provided answer doesn't sound 100% natural.. it should be Ваша сестра вас видит.
The provided answer sounds absolutely natural to my ear, though your variant does as well.