"De bank werd soms gebruikt als bed."

Translation: The couch was sometimes used as a bed.

[mutthopkins]

Or " The Bank was sometimes used as a bed"? I have seen banks used as both a sleeping place and a urinal, so it seems valid - but sadly not accepted.

[NicoleFran3]

But sometimes a bed is used as a bank (i.e. money kept under the mattress) ;)

[Willem.s.both]

Why is gebruikt not at the end of this sentence?

[Simius]

That would also be fine. A prepositional clause (like "als bed") can be placed after words that normally go at the end (like a past participle or infinitive).

More info here: http://www.dutchgrammar.com/en/?n=WordOrder.65