Improving Learners' English-Speaking Accuracy by Using Interrogative Constructions

English speaking accuracy is one of the most important aspects of Business English. While most studies are conducted to improve English speaking accuracy, they neglect phrasal semantics. This present study involves 30 participants from Phu Em Company. The study employs a mixed-methods design in which the quantitative approach helps quantify the speaking accuracy scores made by learners while the qualitative approach explores how learners perceive the use of interrogative constructions. The instruments are a questionnaire and an interview. Data analysis procedures include a theme analysis of the interview data, a statistical analysis of the test and survey data, and integrated findings. The findings from this research provide evidence that using interrogative constructions does not improve grammatical or phonological accuracy but improves expressing accuracy. The study also reveals that 58% of EG learners provide positive feedback on the use of interrogative constructions in learning English speaking skills. Based on the findings, several suggestions are offered to teachers and learners.