Conversely, if one of the clauses is non-ta-marked and the other is a to-form, the interpretation from the utterance time perspective entails that from the perspective of the matrix clause time.
in these foregoing studies, a feature MEDiUM-TiME was introduced as a mediator of temporal information between the subordinate and matrix clauses, which is only motivated by the difference in the tense interpretation of non-ta forms depending on their Aktionsarten.