Shely Perbina and Ayu, “THE CORRELATION BETWEEN STUDENTS’ UNDERSTANDING IN WH- QUESTIONS AND THEIR SPEAKING ABILITY IN EXPRESSION OF ASKING AND GIVING OPINIONS OF THE EIGHTH YEAR STUDENTS OF SMP SWASTA HARAPAN BANGSA KUALA”, SJIP, vol. 7, no. 1, pp. 28–38, Jul. 2021.