What is the difference between "unser" and "unsere"? How do you know when to use one or the other?
It's "Unser Freund ist da" our friend is there ; "Unsere Freunde sind da" our friends are there. You also use "unsere before a feminine singular name, Eg. unsere Mutter. ABER unser Vater.
When do you use da as opposed to dort?
If you're being open minded about relationships then why you did not except 'our boyfriend' as an answer. Every time I see Freund in masculine form I write boyfriend so that I would not be marked wrong, and you've marked this one wrong.