摘要：It is widely acknowledged that collocations are one of the most important concerns in EFL classes and materials. The significance of second language learners possessing some knowledge of collocations is now widely recognized. Also, collocations play significant role in second language learning, especially at the intermediate and advanced levels. The present study intended to investigate Ike influence of knowledge of collocation on writing ability of advanced EFL learners. Eighty Iranian advanced students participated in this study and their writings ability was analyzed to determine the collocations they produced. The participants' productive collocational knowledge was measured by free-writing tests: three topics were given to them to choose one of topics and write a composition. Their receptive collocational knowledge was measured by a multiple-choice test. Results of the study indicated that knowledge of collocation have not positive effect on production of collocation in free writing by EFL learners but it has positive effect on comprehension of collocation by EFL learners and there is a significant relationship between the receptive knowledge and productive knowledge of collocations.
