Add Wortschatz & Grammatik A1 Abschnitt J (Nomen und Artikel)

Plural review, definite/indefinite/zero article choice, full
Possessivartikel case declension, and nicht/kein negation (pp. 79-84).
Flags J4's Akkusativ/Dativ Possessivartikel endings as grammar beyond
Menschen A1.1's Nominativ-only mein/dein.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

Ergaenzung/INDEX.md

@@ -26,6 +26,7 @@ inside each Abschnitt file instead.
 (Abschnitt I onward, from p. 70) starts next.*
 
 | I | [Verben](wortschatz-grammatik-a1/abschnitt-i.md) | 70–78 | L1-4, L7, L9, L11, L12 (Imperativ, müssen/wollen/dürfen, würden-Bitten new/A2) | done |
+| J | [Nomen und Artikel](wortschatz-grammatik-a1/abschnitt-j.md) | 79–84 | L2, L3, L5, L6 (Possessivartikel case declension new) | done |
 
 ## Hören & Sprechen A1 (`hoeren-sprechen-a1/`)
 

Ergaenzung/wortschatz-grammatik-a1/abschnitt-j.md

@@ -0,0 +1,128 @@
+# Wortschatz & Grammatik A1 — Abschnitt J: Nomen und Artikel
+
+Seiten 79–84 (Teil 2 Grammatik) · Lösungen S. 113 · Übungen J1–J5
+
+## Overview
+
+- Skill focus: Grammatik (plural formation, definite vs. indefinite
+  article choice, Possessivartikel declension, negation with
+  nicht/kein)
+- Topic: plural nouns in a shopping-list/family context, definite vs.
+  indefinite article usage in a connected text, possessive articles
+  across all persons and cases, sentence negation
+- Relates to *Menschen* Lektion(en): **L3** (Possessivartikel mein/dein —
+  J4 extends this to **all** persons: sein/ihr/unser/euer/Ihr, which
+  Menschen A1.1 only partially covers), **L5/L6** (ein/eine, plural
+  endings — J1/J2 direct reinforcement), **L2/L6** (Negation mit
+  nicht/kein — J5 reinforces and extends this). **New beyond Menschen
+  A1.1**: J3's systematic definite-vs-indefinite-article decision
+  exercise (including the "zero article" case for plurals/uncountables)
+  is more explicit than anything in the main course; J4's full
+  Possessivartikel case declension (Nominativ/Akkusativ/Dativ endings
+  across all persons) goes beyond Menschen A1.1, which only teaches
+  Possessivartikel in the Nominativ.
+
+## Grammar covered
+
+### J1–J2: Plural review (reinforces Menschen L6)
+Shopping-list and "we have twins now" contexts drilling plural forms of
+food nouns, quantity containers (Packung, Dose, Becher, Flasche), and
+household/baby items.
+
+**Tipp**: always learn nouns with their article **and** plural form
+together (die Frau, -en; das Kind, -er).
+
+### J3: Bestimmter vs. unbestimmter Artikel — **more explicit than Menschen A1.1**
+A connected "dream house" text where every noun mention requires
+choosing definite (der/die/das), indefinite (ein/eine), or **no article
+at all** (for plurals/uncountable nouns in a general sense, marked "–" in
+the exercise). General pattern:
+- **Indefinite/no article**: first mention of something, or speaking
+  generally (Ich möchte einen Kamin — a fireplace, not specified which).
+- **Definite article**: something already mentioned, unique, or specific
+  (Das Schlafzimmer hat einen Balkon — "the" bedroom, already
+  established).
+- **Zero article**: plural nouns used generally (Blumen, Bäume, Tomaten —
+  "flowers" in general, not specific ones).
+
+### J4: Possessivartikel — full declension, **new beyond Menschen A1.1**
+
+Menschen A1.1 (L3) introduces mein/dein in the **Nominativ** only. This
+exercise drills **all persons** (mein/dein/sein/ihr/unser/euer/Ihr) **and**
+shows their **Akkusativ/Dativ** endings changing with the noun's gender
+and case:
+
+| Person | Nominativ (der) | Akkusativ (den) | Dativ (dem/der) |
+|---|---|---|---|
+| ich | mein | meinen | meinem |
+| du | dein | deinen | deinem |
+| er | sein | seinen | seinem |
+| sie | ihr | ihren | ihrem |
+| wir | unser | unseren | unserem |
+| ihr | euer | euren | eurem |
+| Sie | Ihr | Ihren | Ihrem |
+
+(Feminine/plural nouns take -e in Nominativ/Akkusativ and -er in Dativ,
+following the same pattern as ein/eine/kein — e.g. meine Schwester,
+meiner Schwester.)
+
+### J5: Negation — nicht vs. kein (reinforces Menschen L2/L6)
+Full-sentence negation practice: **kein/keine** negates an indefinite-
+article or zero-article noun (keinen großen Fisch, keine Fahrradtour);
+**nicht** negates everything else (verbs, adjectives, definite-article
+nouns, adverbs) — "Ich bin nicht zum Fischen gegangen," "Das Wetter war
+nicht gut."
+
+## Exercise summary
+
+1. **J1 Einkauf für eine Großfamilie** — complete a shopping list with
+   plural noun forms (with quantities).
+2. **J2 Wir haben Zwillinge!** — pluralize 15 singular items ("not just
+   one X, but two...") for a family with twins.
+3. **J3 Nur ein Traum …** — choose definite/indefinite/no article for 27
+   blanks in a connected "dream house" description.
+4. **J4 Was zu wem gehört** — fill in the correctly declined
+   Possessivartikel across 8 short first/second/third-person texts.
+5. **J5 Falsch gedacht!** — rewrite 12 positive predictions as negated
+   past-tense statements (nicht/kein), in a "what really happened"
+   narrative twist.
+
+## Answer key highlights
+
+- J1: Äpfel, Trauben, Tomaten, Salate, Fische, Becher, Eier, Dosen,
+  Nudeln, Brötchen, Flaschen, Packungen, Kiwis.
+- J2: Kinderwagen, Milchflaschen, Betten, Autositze, Kinderlöffel,
+  Kindergartenplätze, Teddys, Fahrräder, Sonnenbrillen, Kinderzimmer,
+  Radios, Computer, Schreibtische, Schultaschen, Männer.
+- J3: einem, dem, Das, einen, dem, –, –, ein, Der, –, –, –, –, dem, –,
+  –, –, –, einem, ein, eine, eine, ein, Das, einen, den, ein (positions
+  1–27 in order).
+- J4 (selected): 1. Mein; Mein; meine; meinen; meinen; meiner
+  2. dein; deine; dein 3. Seine; seinem; seinen; seine 4. ihre; ihrem;
+  ihre; ihr 5. Unser; unseren; Unser; unsere 6. eure; euer; eure;
+  eurem 7. Ihren; Ihren; Ihre 8. Ihr; ihren; Ihr; ihre.
+- J5: nicht zum Fischen; keinen großen Fisch; nicht gut; keine
+  Fahrradtour; meine Freunde nicht; keinen Film; nicht in die Diskothek;
+  kein Mädchen; nicht lange; nicht so richtig; keinen großen
+  Sonntagsbraten; meine Nachbarn nicht.
+
+## Notes / gotchas
+
+- **J4 is the standout "new grammar" item here** — Menschen A1.1 never
+  drills Possessivartikel case endings (only the bare Nominativ form
+  mein/dein). If the student hasn't covered Akkusativ/Dativ articles
+  formally yet, this exercise will feel like a jump; consider it optional
+  enrichment rather than required review.
+- **J3's "zero article" case is worth explaining explicitly**: German
+  drops the article for plural/uncountable nouns used in a general sense
+  (Blumen sind schön = "flowers are beautiful" in general), which has no
+  clean English equivalent since English also often drops the article
+  there — but German learners from article-heavy L1s (Romance languages)
+  may over-apply an article here.
+- **J5 reinforces nicht/kein** but assumes comfort with Perfekt (L11/L12)
+  since all the negated sentences are in past tense — good combined
+  review if both grammar points are already familiar.
+- **The Possessivartikel pattern (J4) mirrors ein/eine/kein's declension**
+  — worth pointing out to the student that once they know how
+  ein/eine/kein changes by case and gender, mein/dein/etc. follow exactly
+  the same endings.