This research examines adjective clauses in the book “Rahasia Lancar Berkomunikasi” by Mulasih Tary & Devy Ardiyanti. The study aims to analyze and reveal the formation, types of meanings, and functions of adjective clauses in the book, as well as their relation to real-life situations in society. The research uses a descriptive qualitative method with a theoretical approach, analyzing adjective clauses based on data by considering their structural formation and classifying them descriptively align with relevant theory. The adjective clauses found in the book “Rahasia Lancar Berkomunikasi” include those with meanings related to physical conditions, inner qualities, and emotional states. By understanding the formation, the type of meanings, and functions of adjective clauses in connection with everyday life, it is hoped that readers will gain better insight into effective language use. Knowledge of the role of adjective clauses in daily communication can serve as a foundation for society to interact more wisely and build good social relationships and it can assist in related fields.

This research analyzes the news text on the ISKNEWS.COM online news portal. Then the other purpose of this research is to prove that the news texts in the portal, after being analyzed, are worthy of being used as teaching materials for critical reading for grade XI high school students. This research uses a descriptive qualitative approach and a syntactic approach as the theoretical approach. The writer obtained data by reading several related references and recording information that could be used as data. For this reason, reading and scanning techniques were used in this research. The data in this study are news texts from the January 2024 edition of the ISKNEWS.COM online news portal. The data analysis method used is the agih method. The writer analyzes the text by identifying sentences that do not follow the syntax rules and the feasibility of the text as a good and correct news text. The analysis results show several syntactic errors identified, namely sentences with non-standard structures, the use of absorbed words in sentences, ambiguous sentences, inappropriate diction in sentence formation, and the use of words inefficiently. In addition, the news puzzle is proven to be used as teaching material for critical reading for grade XI high school students. This is because the syntactic errors found are still tolerable, and the text has a good structure.

The accuracy of language in news texts is critical because appropriate language makes it easier for readers to understand. The quality of correct and appropriate language is essential in conveying information that is clear, accurate, and easy for readers to understand. Language errors in news texts can interfere with understanding and affect readers' minds. Therefore, correcting language errors in news texts, especially for junior high school students, is essential as part of the learning process. This research aims to provide a deeper understanding of language errors in the news texts studied, using data collection methods, listening and note-taking techniques, and analysis using the agih method. The research used a qualitative descriptive design approach to analyze errors in language use in news texts in the April 2023 Edition of Derap Guru Magazine, which included errors in conjunctions, punctuation, spelling, standard words, capital letters, abbreviated words, and ineffective sentences. Students can improve their language skills by analyzing language usage errors in news texts as teaching materials while deepening their understanding of news texts and effective language use.