Whose
Whose is the possessive form of who. It means “belonging to whom.” Whose usually sits before a noun (= substantiv).
Examples
Whose bike was expensive?
Whose car is this?
My friend knows the boy whose iPhone was stolen.
Swedish
vems, vars, vilkas, vilkens
Who’s
Who’s is a contraction of either who is or who has. It has no other uses.
Examples
Who’s your best friend?
Who’s eaten the last cookie?
I have met the priest who’s delivering tomorrow’s sermon.
Swedish
vem är, vem har
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