whats wrong?
¿Quién es el compañero de cuarto de ellos?
6 Answers
El compañero de cuarto de Jaime es Manuel.
Then you might want "de él", singular, instead of ¨de ellos¨, plural.
El compañero de cuarto de Jaime es Manuel. is the answer to the question.
If you had posted this originally, all your answers would be different due to having some context. The question could be either "¿Quién es el compañero de cuarto de él?" or "¿Quién es el compañero de cuarto de Jaime?"
Many times it´s difficult to know the answer to these types of exam / textbook questions that their writers want because they seem to expect students to know what they are thinking when they write them.
Looks good to me, but to know if an answer is right, one must know the question, the context and goal. For instance, if this were one type of possessive pronoun exercise, the questioner might validly require ¨suyos¨ (that was our last test, so it´s sticks in my mind)
Nothing intrinsically wrong with what you wrote. It´s probably the answer to some question in the world out there, but perhaps not to what your questioner asked?
Maybe you can use "con ellos" = with them ...".Who shares the room with them?".....Con quien comparten el quarto ellos ?..These are just my guesses if someone said you were incorrect
Are you sure something is wrong?
Looks ok to me, 'who's their roomate?'