The effect of substitution drill technique on students’ vocabulary mastery at the eleventh grade of SMA N 1 Padang Bolak Julu

Septiana, Kiki (2025) The effect of substitution drill technique on students’ vocabulary mastery at the eleventh grade of SMA N 1 Padang Bolak Julu. Undergraduate thesis, UIN Syekh Ali Hasan Ahmad Addary Padangsidimpuan.

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Abstract

This research investigates the effect of the Substitution Drill Technique on students’ vocabulary mastery at the eleventh grade of SMA N 1 Padang Bolak Julu. Vocabulary plays an essential role in supporting students’ skills in listening, speaking, reading, and writing. However, preliminary observations indicated that students at the school faced several difficulties in learning vocabulary, such as limited vocabulary retention, lack of motivation, and low confidence in using English. To address these issues, the researcher implemented the Substitution Drill Technique, a language practice activity where students repeat and substitute specific words in sentence patterns to reinforce vocabulary and sentence structure. This research employed a quantitative experimental method using a pre-test and post-test design. The population consisted of 80 eleventh-grade students, from which 40 students were assigned to the experimental group and 40 to the control group. The experimental class was taught using the Substitution Drill Technique, while the control class received conventional instruction. The data were analyzed using SPSS version 26 and the independent t-test formula. The findings of the research indicated a significant improvement in the vocabulary mastery of students in the experimental class. The mean pre-test score of the experimental group was 39.20, which increased to 75.10 in the post-test. Meanwhile, the control group increased only from 34.50 to 47.10. The t-test result showed that tcount (11.601) was higher than ttable (2.015) at the significance level of 0.05, indicating that the alternative hypothesis (Ha) was accepted and the null hypothesis (Ho) was rejected. Based on these results, it can be concluded that the Substitution Drill Technique has a significant and positive effect on students’ vocabulary mastery. The technique helps students memorize vocabulary, understand word usage, and apply vocabulary in sentence construction more effectively. Therefore, this technique is recommended for English teachers as an alternative instructional strategy in teaching vocabulary.

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