The present study aimed at finding out the problems of high proficiency level Iranian learners of English with English collocations. The study had two phases. In phase I, about 2400 pages of materials produced (in English) by 27 subjects were carefully studied and a list of collocational errors were extracted. The list was then analyzed and five patterns were found. In phase II, six cued production tasks were developed which were given to 64 subjects. Results showed that Iranian advanced learners of English do have serious problems with English collocations (about 55 percent of the time). The results of the present study can have theoretical and pedagogical implications for syllabus designers, teachers, and translators.
