After a long vowel, a diphthong, or an unstressed -el/-en/-er ending, add -tje.
Every Dutch diminutive is a het-word and forms its plural with -s (knietjes).
The diminutive (verkleinwoord) of knie is "het knietje". After a long vowel, a diphthong, or an unstressed -el/-en/-er ending, add -tje.
Het. Every Dutch diminutive is a het-word, so it is het knietje even though knie takes de.
Diminutives always add -s, so the plural is knietjes.
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