"My best friend had taken my boyfriend."

Translation: Min bästa vän hade tagit min kille.

[KarmaWeasel]

Perhaps I misunderstood, but I thought that pojkvän and kille were not synonyms. In that pojkvän referred exclusively to a romantic relationship, and kille would just be a guy, who is a friend.

[devalanteriel]

I realise this is a late reply, but in case somebody else enters the thread and is wondering: you can also use kille for boyfriend colloquially - but not pojkvän for guy. The latter is, as you say, exclusively for a romantic relationship. Also, the same holds true for tjej / flickvän (girl / girlfriend).

[Radio.edit]

It doesn't feel fair to penalise users with a wrong answer for not selecting both of those.

[devalanteriel]

Probably not, no, since one is actively taught and one just generally accepted as an alternate translation. But Duolingo chooses words for multiple-choice questions by itself, and we have zero say over how it does so.

[ekufi]

Bästa and bäste are the same thing, except written slightly differently?

[Zmrzlina]

They mean the same, but the -e ending on adjectives is reserved for actual male people. It's always OK to write -a instead.

[HarryFletc3]

I don't understand why väninna is not accepted here?

[Zmrzlina]

It's rarely used nowadays, and the translation doesn't mean an explicitly female friend.

[viutilo]

Varför "min bestis" inte accepteras?

[devalanteriel]

That's a much too colloquial term to accept. Also, note the spelling: bästis.

[fl1cka]

"Min bästa kompis" not accepted?

[devalanteriel]

That's actually accepted.

[hiro934956]

Who is talking or saying that, a girl or boy?

[devalanteriel]

It's impossible to say without context.