17. How acquisition works, and your path to C1

Rules make you notice a structure; only large amounts of input and corrected output make it automatic. This guide supplies the noticing; the daily system below supplies the volume.

Six principles from second-language research

1. Comprehensible input (Krashen): you acquire structures by understanding a lot of language slightly above your level. Volume matters more than intensity.
2. Noticing (Schmidt): you only acquire forms you consciously register. Knowing that dem signals Dativ is what makes you see it in the next 500 sentences.
3. Pushed output (Swain): speaking and writing expose the gaps that reading hides. You find out you don’t know an adjective ending only when you have to produce one.
4. Feedback: errors you are told about, with the rule, get fixed; errors nobody points out fossilise.
5. Spaced retrieval: recalling a word at growing intervals (the method behind Anki) stores it far more cheaply than rereading it.
6. Automatisation (skill acquisition theory): a rule starts as knowledge you compute slowly and becomes a fast habit only through repeated use in real tasks, ideally in whole chunks.

What C1 means

On the Common European Framework (CEFR), C1 means you understand long, demanding texts and their implicit meaning, speak fluently and spontaneously without obvious searching for words, use German flexibly for social, academic and professional purposes, and write clear, well-structured, detailed texts on complex subjects. The jump from B1 is mostly range (vocabulary and collocations), accuracy under speed, and register control.

The roadmap

[embedded content: B1 to C1 · 3 phases, each closed by an exam]

Phase 1 draws on sections 3 to 10 of this guide, phase 2 on sections 9, 12, 13 and 15, and phase 3 on sections 14 to 16. Take a mock exam before each real one; the error log (section 18) tells you when you are ready to move on.

A daily system (about 90 minutes)

Block	Time	What to do
Spaced repetition	15–20 min	Anki cards: noun with article and plural, verb with frame (sich bewerben um + Akk), whole sentences with the target form blanked out
Input with noticing	30 min	A podcast episode or article at your level; pick three sentences and label every case, ending and verb position
Writing	20 min	150–250 words on a real topic, then corrected with the rule named for each error; log the errors
Speaking	15–20 min	Shadow a short clip, or talk through your day aloud using that day’s target structure
Weekly	2–4 h	Real conversation: a course at the Goethe-Institut Bonn or VHS Bonn, a language tandem, a Stammtisch, or German at work

Using Claude as a tutor

Prompts that produce useful feedback:

• Korrigiere meinen Text. Markiere jeden Fehler mit einer Kategorie (Kasus, Genus, Adjektivendung, Wortstellung, Verbform, Präposition, Wortwahl, Register), erkläre die Regel kurz und gib mir drei neue Übungssätze zum häufigsten Fehler.
• Sprich nur Deutsch mit mir auf B2-Niveau. Nach jeder meiner Nachrichten: liste meine Fehler auf und zeige die korrigierte Version.
• Gib mir zehn Lückensätze nur zu Wechselpräpositionen. Zeige die Lösungen erst, wenn ich antworte.
• Formuliere diesen Absatz im Nominalstil um, und erkläre jede Umwandlung.