Within the realm of lexis, the area of collocation is of prime importance to producing natural-sounding language for anyone learning a foreign language. This study aimed at investigating the effects of two modes of sentence writing versus multiple-choice test practice manipulation on Iranian intermediate EFL learners’ lexical collocation learning. For this purpose, to ensure the homogeneity of the participants, Preliminary English Test (PET) was administered to 87 students studying English at two English institutes of Ofoghhaye Nour and Nourmahdi in Roudsar, Guilan, through which 60 students were selected as the target participants. They were intermediate students with the age range between 17 and 23. They were then divided into two equal comparison groups: Sentence-writing Group (SRG) and Multiple-choice Group (MCG). A piloted pretest of lexical collocation was administered to both groups. Then both groups underwent a 7-session treatment. SRG was treated by the virtue of sentence-writing practice for the target collocations, and MCG was instructed through recognition practice, here multiple-choice practice. After the treatment period, the same version of lexical collocation test was administered to both groups as posttest to examine the effectiveness of the treatments. The results of paired-samples and independent samples t-tests indicated that both groups had collocation gains but the effectiveness of multiple-choice test manipulation on learners’ lexical collocation outweighed that of the sentence-writing mode of test practice manipulation. The implications and recommendations were also presented.
