This research is an investigation to find out the linguistic errors of freshmen enrolled in English 1
as a foundation course at Burapha University, Thailand. There were 212 subjects in this study
and they were assigned to do a controlled writing dialogue as pair work. The data consisted of
106 first draft dialogues of approximately 150 words per dialogue. The errors were recorded and
classified. The findings of this research reported that the most frequent errors in order of number
were capitalization, full stop, subject-verb agreement, adjective, verb tense and prepositional
verb phrase. The results could be used for pedagogical purposes to improve student EFL writing.