Based on the data from the Czech learner corpus CzeSL-SGT and their comparison with native speaker corpora (SYN2020, SKRIPT2012), the paper accounts for the specific use of content clauses with the conjunctions že, aby, ať, jestli, zda, zdali and -li in the language of nonnative speakers, taking into consideration their language group (i.e. Indo-European, non-Indo- European and Slavonic languages).
The analysis focuses on typical collocations, their over- and underuse in learner interlanguage and description of language phenomena that differ from native usage. The data show that non-native speakers tend to overuse semantically wide lexical items, which they are familiar with, at the expense of more specific ones.
The differences between learner interlanguage and native usage are apparent in collocations, different types of verb complements and across language groups.