After -m following a long vowel, diphthong or another consonant, add -pje.
Every Dutch diminutive is a het-word and forms its plural with -s (boompjes).
The diminutive (verkleinwoord) of boom is "het boompje". After -m following a long vowel, diphthong or another consonant, add -pje.
Het. Every Dutch diminutive is a het-word, so it is het boompje even though boom takes de.
Diminutives always add -s, so the plural is boompjes.
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