Breakdown of Kan du hålla ett öga på väskan?
du
you (singular)
väskan
the bag
kunna
to be able to, can
hålla ett öga på
to keep an eye on
Questions & Answers about Kan du hålla ett öga på väskan?
Does Swedish really use the exact same idiom "keep an eye on" as English?
Yes! The phrase hålla ett öga på translates word-for-word to "keep an eye on" and is used in the exact same casual way to ask someone to watch your things.
Why is the verb hålla used here instead of behålla for "keep"?
Hålla is used for "hold" or maintaining a physical or figurative state, which fits the imagery of holding your gaze on something. Behålla means to retain possession or ownership of something (like keeping the change or keeping a gift). Since you are just watching the bag, not claiming ownership of it, you use hålla.
Could I use a possessive pronoun here, like min väska, instead of just väskan?
You absolutely could say min väska (my bag), but Swedish often prefers just the definite form (väskan) when the context makes it obvious whose bag it is. If you are standing right there gesturing to your bag, väskan sounds perfectly natural and idiomatic.
What if I want to say "keep an eye OUT for" something instead of "keep an eye ON" something?
That requires a slightly different phrase. To "keep an eye out for" or "look out for" something, you would change the expression and use hålla utkik efter.