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Merci Frank. This is very clear and helpful. I was pretty lost when I read " J'ai besoin des clés" :P
A similar question:
J'ai besoin de lunettes? Not …des lunettes? (I don't understand this)
J'ai des lunettes? Not …de lunettes? (This makes sense to me)
There are set expressions like avoir peur de and avoir besoin de.
As explained in the earlier post these can be followed either by de or des depending on the specific sense expressed.
So you can say either j'ai besoin de lunettes or j'ai besoin des lunettes (ones you already had in mind)
But you can't really say j'ai de lunettes (except perhaps in certain unusual circumstances) ;It has to be j'ai des lunettes