Error catalogue
The Russian mistakes YabLab understands
YabLab classifies every slip in your writing against a closed taxonomy of learner errors — grounded in the error annotation of the Russian Learner Corpus (RLC). 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 19
- Latin letter inside a word
- Name spelled wrong in Cyrillic
- Foreign word left untranslated
- Vowel after a hushing consonant
- Unstressed o vs a
- Unstressed e vs i
- Voiced vs voiceless consonant
- е instead of э
- Single vs double n
- Missing soft sign
- -тся vs -ться in verbs
- Missing hard sign
- Prefix ending з vs с
- Word badly misspelled
- Wrong spacing in a word
- Missing hyphen
- Unnecessary hyphen
- Wrong stem alternation
- Missing fleeting vowel
Grammar 26
- Non-existent ending
- Wrong declension ending
- Wrong noun gender
- Wrong number of an uncountable noun
- Wrong irregular plural
- Invented non-existent word
- Wrong word-building suffix
- Adjective gender mismatch
- Past-tense verb gender mismatch
- Adjective case mismatch
- Adjective number mismatch
- Subject-verb person mismatch
- Wrong conjugation ending
- Wrong verb aspect
- Wrong aspect in a verb pair
- Wrong verb tense
- Missing conditional particle бы
- Wrong imperative form
- Short vs long adjective
- Wrong comparative form
- Wrong superlative form
- Dangling adverbial participle
- Wrong participle form
- Genitive after negation
- Missing double negation
- Misplaced particle не
Word grammar & complementation 13
- Wrong case after a verb
- Wrong case after a noun
- Wrong case after an adjective
- Wrong case after a numeral
- Subject not in nominative
- Wrong preposition
- Wrong case after a preposition
- Missing or extra preposition
- Missing or extra -ся
- Wrong passive construction
- Redundant copula есть
- Unidirectional vs multidirectional motion
- Wrong motion-verb prefix