German · Chapter 7 · Lesson 12 · Grammar primer
Plural nis neuter en
Prescribed by the AQA specification.
The short version
Every -nis noun doubles its s in the plural
Ergebnis, Kenntnis and Geheimnis all end in -nis, and all of them add -se, not -en, no matter whether the noun is neuter or feminine. The doubled s is the giveaway: Kenntnisse has a sharp, voiceless s, where the wrong Kenntnisen would have a single s voiced like a z.
die Ergebnisse, die Kenntnisse
A few neuter nouns plural like feminine ones
Auge, Ohr, Bett, Hemd, Interesse and Ende are all neuter in the singular but add -(e)n in the plural, the ending you would expect from a feminine noun instead. There is no shortcut here: learn this short list by heart rather than trying to derive it from the gender.
die Augen, die Betten
That's the gist. The full article goes deeper - more examples, the edge cases, the why - and the practice below scores like a vocabulary session and earns the same XP.
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10-question session
One question at a time, mixed across the exercises in this lesson. Miss one and it comes back round before the end. There are 20 in all: practise more afterwards if you want them.
Lesson 12 of 21 in this chapter