Spanish language Q&A Forum

Hello, please can you explain why the above sentence is using a subjunctive conjunction! As far as I was a aware, repetition, description, ifs, mental states and obligations use subjunctives, but I do not see anything like that here.

The kwiz question is: Cristina no sabe todavía ________ va a celebrar su cumpleaños.

The most import possibilities are dónde and donde.

If i look in the lesson: Difference between dónde and donde (with and without a written accent)

i see: if you can substitute it for "in what location", you can use dónde.

This answer was wrong, it should be donde. I don-t understand that, it seems to contradict the lesson.

By process of elimination, I selected estuvieron as being the correct answer; however, my preference would have been estaban. 

See the example given below:

Mario estaba de camarero en un restaurante.
Mario was working as a waiter in a restaurant.

Here is the question with the answer:

Mis hijos _estuvieron_ de vendedores en una tienda.
My children were working as shop assistants in a store.

My choice:
Mis hijos _estaban_ de vendedores en una tienda.

Would you explain the reason for the answer being the preterite and not the imperfect, please.

Why is the past participle used after the verb sigues.  Can you point me to the lesson where this structure is explained. Many Thanks

Does no debe stand for must not or don't have to ?

Regards, 

Alexander

I don't understand why naranja is plural in one example and singular in the other.