Error catalogue
The German mistakes YabLab understands
YabLab classifies every slip in your writing against a closed taxonomy of learner errors — grounded in the annotation of the MERLIN and Falko learner corpora. Each entry below is a real, drillable rule: the checker spots it, explains it in your language, and helps you practice it until it is gone for good.
Spelling & word form 13
- Spelling: wrong letter
- Spelling: swapped letters
- Spelling: ss versus ß
- Spelling: double consonant or vowel length
- Spelling: missing umlaut
- Capitalization: nouns
- Capitalization: sentence start
- Capitalization: polite Sie
- Capitalization: adjectives stay lowercase
- Word boundary: wrongly split
- Word boundary: wrongly joined
- Apostrophe: false genitive
- Abbreviation: spacing and dots
Grammar 38
- Case: subject in nominative
- Case: accusative direct object
- Case: dative indirect object
- Case: genitive attribute
- Case: predicate in nominative
- Gender: wrong article
- Gender: pronoun reference
- Gender: by word ending
- Plural: wrong form
- Number: article–noun agreement
- Adjective: weak after der/die/das
- Adjective: mixed after ein
- Adjective: strong without article
- Adjective: missing ending
- Adjective: ending on predicate
- Article: missing
- Article: redundant
- Article: definite versus indefinite
- Pronoun: wrong case
- Reflexive pronoun: wrong form
- Relative pronoun agreement
- Possessive pronoun agreement
- Subject–verb agreement
- Verb: strong stem change
- Verb: wrong past tense form
- Past participle: ge- prefix
- Perfect: haben versus sein
- Verb: invented form
- Tense: wrong choice
- Future: werden plus infinitive
- Konjunktiv II for unreal
- Konjunktiv I in reported speech
- Imperative form
- Passive: werden versus sein
- Passive: agent with von
- Modal: bare infinitive
- Modal: conjugation
- Wrong word class
Word grammar & complementation 12
- Preposition: fixed accusative
- Preposition: fixed dative
- Preposition: genitive
- Two-way preposition: accusative for direction
- Two-way preposition: dative for location
- Verb: wrong preposition
- Verb: governed case
- Adjective: wrong preposition
- Pronominal adverb: da-compound
- Valency: missing object
- Valency: extra argument
- Missing main verb
Word choice 9
Extra, missing & misordered words 15
- Word order: verb in second position
- Word order: subject–verb inversion
- Word order: verb-first question
- Word order: verb last in subordinate clause
- Word order: verb last in relative clause
- Sentence bracket: participle at end
- Separable prefix: at clause end
- Prefix: separable versus inseparable
- Word order: adverbials (TeKaMoLo)
- Word order: object pronouns
- Negation: nicht versus kein
- Negation: position of nicht
- Connector: coordinating versus subordinating
- Connector: wrong choice
- Connector: two-part pairs