The genesis of time is explained in the spirit of constructivism combined with the activity approach to cognition. The cardinal temporal categories of present, past, and future are discussed in terms of action-thoughts understood as elementary units of activity whose structure is determined by linguistic semiosis. Husserl’s tripartite model of the phenomenology of time (prime perception, retention, protention) is applied to the analysis of the subject’s experience of his actions. It is demonstrated that, while our lived present is composed of the actually performed actions, our past and future are constructed by reflexive action-thoughts in the cognitive domain of language. It is emphasized that the construction of a temporal sequence th...