Under the assumption that acquiring a second language (L2) is intrinsically different from acquiring a first language (L1), all L2 learners, both children and adults, are expected to exhibit a similar acquisitional pattern, which differs from children acquiring an L1. This paper discusses the expected similarities and differences between child and adult L2 learners based on the deliberation of a morphological phenomenon.
タカユキ ミウラ (Sun,) studied this question.