The path of learning a new language must find a route between the need to express oneself and the desire to do so accurately. The article discusses this relationship between learning to use various constructions and getting them right. The pseudolongitudinal data consist of about 1200 texts written by young and adult learners of Finnish as a second language, assessed to represent the functionally determined Common European Framework of Reference (CEFR) levels A1–C2. The results are sifted from a large number of studies which have followed the use and accuracy of a given construction in these texts. The results show that an increase of use often precedes an improvement in accuracy at the next CEFR level. Common constructions peak earlier both in use and accuracy than the less obligatory ones but errors in rarer constructions can function as indicators of high-level language skills.