Abstrak
This study is based on the problem faced by students in learning Englsih when especially in writing a text . Based on the results of students’ training in the initial research, the researcher found a problem in which some students were influenced by their mother tongue (interlingual) and did not succeed in distinguishing the rules in English writing. That is because students assume that the sentence structure in English is the same as Indonesian, whereas between Bahasa Indonesia and English they have different rules. Based on this phenomenon, the researcher conducted a study to find out the language errors of the ninth grade students in writing procedure text at MTsN 3 Pariaman. The form of this study is descriptive qualitative. The samples from this research are ninth grade students of MTsN 3 Pariaman. The researcher used a total sample consisting of six classes IX.1 until IX.6 totaling 17 students. Meanwhile, the instruments in this research is document analysis. Documents were analyzed using Ellis’ theory and grouped based on the type of interlingual error to determine the dominant types of interlingual error made by students. The findings indicate that the errors influemced by their mother’s tongue language are mostly done on students the first is transfer of morphological elements, it emerged 159 times. The second highest is the transfer of grammatical elements, it emerged 16 times. The third highest is the transfer of stylistic and cultural elements, it emerged 4 times. And the lowest is transfer of lexico semantic elements, it emerged 2 times.