A Case Study of Students’ Difficulties in Learning Conditional Sentence at the Eleventh Grade Students’ of SMA N 4 Purworejo in the Academic Year of 2016/2017. scripta [Internet]. 2019 May 30 [cited 2026 Sep. 2];6(1). Available from: https://jurnal.umpwr.ac.id/index.php/scripta/article/view/758