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 (periodetjes).
The diminutive (verkleinwoord) of periode is "het periodetje". 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 periodetje even though periode takes de.
Diminutives always add -s, so the plural is periodetjes.
The platform drills the grammar that makes your Dutch natural, in real A2 exam tasks, AI-graded across all five DUO sections.