"Det är mina nycklar."
Translation:It is my keys.
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Apart from what I just wrote in answer to kathryn.ne, dem är mina nycklar is actually even worse. dem is an object form and can never be used as a subject in a sentence at all. (since de and dem are pronounced the same way, many Swedes struggle with this, so it is a pretty frequently made error, but it's still considered wrong).