Öz This study focuses on the colligation of data in the written form. Colligation had been done to the word “TO” and “FOR” from written corpus. The research objectives were to identify the colligations of “TO” and “FOR” in their particular function as prepositions in sentences in the corpus, to discover the similarity and differences of the colligations between “TO” and “FOR” in their particular function as prepositions in sentences, and to examine whether the students had applied correctly in their essays these two particular words with reference to the function as prepositions. The data was collected from essay assignments written by Master students in the Faculty of Engineering, University Malaya. For annotation, UCREL CLAWS5 Tagset was used, with Tagset C5 to select output style of horizontal. The design of corpus used is by ICE. It was found that despite the subjects were Master students, grammatical errors were commonly found in the use of “TO” and “FOR” as prepositions.