Abstrak
Erlin Depianti Putri: 2317.114, “An Error Analysis of Vowel Pronunciation in Student’s Impromptu Speech Activity at The XIIth Grade Students of Islamic Boarding School Ashhabul Yamin”, A Thesis, State Islamic Institute of Bukittinggi, 2021. This research was done because in Islamic Boarding School Ashhabul Yamin, an English teacher of the XIIth Grade Students used an activity in a way to train the students to be able to speak English as a foreign language named impromptu speech where the teacher gave a topic for the students and she asked them to present that topic next meeting. The students will be pointed randomly and this activity was done every meeting before starting the lesson. This activity was also done in order to introduce the words in English to the students and made them familiar with the sound of English. However, in learning language, there is the possibility to pronounce the words incorrectly because many factors. As the result, the researcher wanted to analyze is there the errors made by the students during impromptu speech activity relate to pronouncing the vowel sounds. The design of this research was descriptive qualitative research with the observation as the instrument of this research. The researcher also recorded the students’ speech in order to collect the data, then, the researcher analyzed how the students pronounced the words through the observation sheet by hearing for the recording. As the informant, there were 10 students of the XIIth grade students of Islamic Boarding School Ashhabul Yamin from three classes. These students came from these three classes. Each student sometimes presented the different topic, and sometimes they presented the same topic, but the content of the speech was always different. The result of the research showed that all of ten students made the errors. There were four kinds of errors that were probably made by the students while speaking. These errors were omission, addition, substitution, and distortion. Based on these four kinds of errors, the students did three of them; omission, addition, and substitution. There was no students did the distortion. The errors related to pronouncing the English vowel appeared in almost every vowel, but with the different frequency. As the result of the research, the students mostly made the errors about substitution. This error appeared 484 times by calculating all of substitutions made by the students. The second one was omission, with the total of errors was 110 time. The last kind of error was addition with the total of error was about 74 times.