摘要：Error and competence in speaking Bahasa (Indonesian language) are always an interesting topic to discuss because language is dynamic. Mistakes that also reflect language competence can occur in all walks of life from the general public, students, to university students. This paper highlights the mistakes and at the same time, competence in speaking Indonesian language, among students of Diponegoro University. Data was extracted through a questionnaire distributed via MS Form. The results are (a) the average number of students (80-90%) is competent in distinguishing standard and non-standard words, (b) Some students (60-85%) are competent in distinguishing standard/complete form of words (in Predicate) in a sentence, (c) a small portion of students (14-32%) is incompetent to distinguish it, (d) 60-85% of students are able to distinguish effective and ineffective sentences, (e) on average (50%), students are able to distinguish correct sentences in terms of semantics, (f) most students (> 90%) agree: (1) Indonesian language must be maintained, taught and mastered; (2) Indonesian language is related to nationalism, personality and logic.
