This document discusses grammatical collocation, specifically the collocation of prepositions by Azerbaijani English learners. It conducted a study examining the knowledge of 30 junior English learners from Azerbaijan University of Foreign Languages on the collocation of prepositions based on Benson et al's categorization. The study found a total of 1010 collocational errors, with the most in verb+preposition collocations and the fewest in adjective+preposition collocations. The errors resulted from either ignorance of grammatical rules or interlingual transfer from their native Azeri language, which does not use prepositions.