| Analyzing learners’ errors can be one of the ways to minimize or anticipate the difficulties in learning a foreign language (henceforth, FL). In this study, the writer identified and analyzed the sources of the past tense verb form related errors in the writings of the tenth-graders in a senior high school in Jakarta in order to see which factors have a bigger influence on the FL writing, the interference or intralingual factors. This study aims at investigating which factors–interference or intralingual–have a bigger impact on the FL learning process. From the selected 26 writings, the writer identified 138 past tense verb form related errors and four incomplete sentence errors. With respect to the past tense verb form related errors, the writer found that 63,04% of the errors were triggered by either the interference or intralingual factors, 21,74% of the errors were triggered by the intralingual factors, and the rests (15,22%) were triggered by the interference factors. This finding indicates that the intralingual factor has a bigger impact on the FL learning process. |