<![CDATA[This study discusses the problems experienced by third-grade elementary school students in writing sentences, particularly in the use of capital letters and punctuation marks. Writing skills are an essential part of mastering the Indonesian language, yet many students still make fundamental errors that hinder their ability to construct sentences correctly and according to language rules. The aim of this study is to identify the most common types of errors made by students and the factors that contribute to these errors. This research uses a descriptive qualitative approach, with data collection techniques including observation, document analysis of students’ written work, and interviews with classroom teachers. The results show that most students struggle with using capital letters at the beginning of sentences, in writing names of people and places, and often misuse punctuation marks such as periods, commas, question marks, and exlamation marks. The main contributing factors include a lack of understanding of the Enhanced Spelling System (EYD), limited structured writing practice, and teaching methods that do not sufficiently emphasize mechanical aspects of writing. This study recommends the implementation of more contextual and interactive learning approaches to help students better understand and consistently apply correct usage of capital letters and punctuation in their writing. With a solid understanding of linguistic rules, students’ writing skills are expected to improve significantly.]]>
