Nouns ending in an unstressed -ing swap the -ng for -kje.
Every Dutch diminutive is a het-word and forms its plural with -s (opleidinkjes).
The diminutive (verkleinwoord) of opleiding is "het opleidinkje". Nouns ending in an unstressed -ing swap the -ng for -kje.
Het. Every Dutch diminutive is a het-word, so it is het opleidinkje even though opleiding takes de.
Diminutives always add -s, so the plural is opleidinkjes.
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