The temporal adverbial then is cross-linguistically incompatible with the present tense, not only in matrix but also in embedded clauses. In languages such as Modern Greek, Russian, Modern Hebrew, and Japanese, where the present tense can shift referring to the 'now' of the attitude holder rather than the time of the utterance, then remains incompatible with the present, even though the latter denotes a time in the past or future (Ogihara & Sharvit 2012, Sharvit 2018, Vostrikova 2018, Tsilia 2021). Additionally, in Modern Greek, then is at the same time compatible with a deleted past (Abusch 1997), which is interpreted as a present from the point of view of the attitude holder (Tsilia 2022). Thus, then is incompatible with the shifted present, but compatible with the deleted past in the same language, suggesting that the two are not semantically equivalent. We introduce a new interpretation parameter, which we call 'temporal perspective'. The interpretation of tenses and of then is sensitive to the temporal perspective. Tense shift is a result of the shift of the perspective, and the incompatibility between then and the present is derived as a shift together effect (Anand & Nevins 2004, Sudo 2012, Deal 2020). On the other hand, the deleted past is assumed to be stripped of its perspective sensitivity, and therefore does not clash with then. We also provide empirical support for distinguishing the perspective from the context and the evaluation index.