(By Hedvig Skirgård): "This question aims to capture productive marking of tense that makes distinctions into remoteness of time in relation to the point of reference or utterance. The actual marking can be tonal, verbal affixation, suppletion or any other means of marking. ❡
This feature pertains to temporal marking, not aspectual. ‘Present perfect’ and ‘pluperfect’ are not included since they do not denote difference in distance of time but sequence of events."