"My parents are doctors."
Translation:Mina föräldrar är läkare.
I've thought that only ett-words have the same singular and plural - does this also apply for (some) professions? Is there any rule?
Often used synonymously in Swedish, but I personally think that "doktor" sounds a bit childish. Doctors are sometimes referred to as "farbror doktorn" (uncle doctor) to children to make the person seem less dangerous.
Doktor could also mean a title in any subject.