answer their question
No sé como responder a su pregunta.
I don't know how to answer your question.
— Fallen angels (Ángeles caídos) (1995)
Puedo responder a su pregunta.
I can answer your question.
Yo no sabía cómo responder a su pregunta.
I didn't know how to answer his question.
No sabía cómo responder a su pregunta.
I didn't know how to answer their question.
No sabía cómo debía responder a su pregunta.
I didn’t know how I was supposed to answer his question.