"På" eller "i" eller "om" (om tid)
When describing time, I'm confused about which preposition to use and when. I know set expressions such as "i dag," "i morgon," and "i kväll" aren't flexible, but everything else is confusing. For instance:

"Hon kommer på eftermiddagen" = She comes IN the afternoon, but this one uses "på."
"Jag sover i flera timmar" = I sleep FOR several hours, but this one uses "i."
"Vi dricker om en stund" = We drink IN/FOR a moment, but this one uses "om."

I understand prepositions in any language can be confusing to learn, so I wanted to know if there are any rules that could help me. Tack så mycket!

Question

"På" eller "i" eller "om" (om tid)
When describing time, I'm confused about which preposition to use and when. I know set expressions such as "i dag," "i morgon," and "i kväll" aren't flexible, but everything else is confusing. For instance:

"Hon kommer på eftermiddagen" = She comes IN the afternoon, but this one uses "på."
"Jag sover i flera timmar" = I sleep FOR several hours, but this one uses "i."
"Vi dricker om en stund" = We drink IN/FOR a moment, but this one uses "om."

I understand prepositions in any language can be confusing to learn, so I wanted to know if there are any rules that could help me. Tack så mycket!

Answer

http://www.tallstugan.se/0175.aspx
http://www.asinger.net/tidsprepositioner.pdf

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