Majalah Ilmiah Universitas HKBP Nommensen Visi STT No. 1541/SK/Ditjen PPG/STT/1990 Volume 19 Nomor 1 Pebruari 2011 : A Correlation Between Students' Mastery Of Past Tense And Their Achievement In Writing Recount (The Case Of The EC 4 Students OF YPPIA Medan In 2010)