THE ACQUISITION OF PROGRESSIVE AND RESULTATIVE MEANINGS OF THE IMPERFECTIVE ASPECT MARKER BY L2 LEARNERS OF JAPANESE: Transfer, Universals, or Multiple Factors? 論文 Natsue Sugaya・Yasuhiro Shirai ·2007-01-26 ·『Studies in Second Language Acquisition』 29(1) pp. 1-38 doi:10.1017/s0272263107070015