The Aspect Hypothesis as summarized in its simplest form by Andersen (2002: 79) makes the following three claims): 1) [Learners] first use past marking (e.g., English) or perfective marking (Chinese, Spanish, etc.)
5 there is a special kind of Achievements, the so-called [verb+completive morpheme] verb compound, in which -le is quite often rendered unnecessary by the completive morpheme.