The article presents the category of aspect in Polish and French. The first part is theoretical, the second is comparative, consisting of selected sentences in French and their Polish equivalents. The author analyzes the text of The Little Prince by Antoine de Saint-Exupéry and its two translations – by Jan Szwykowski and Zofia Barchanowska. The author analyzes the infinitives, indicative and imperative sentences in the past and future. The Polish language uses derived forms of two different verbal lexemes in order to build the aspectual opposition which can be formed at the level of one tense. The author agrees with Jan Tokarski that the Polish verb is composed of three parts – theme, suffix and ending. All Polish verbs have one combination of endings. The French ones are made of two parts – theme and ending. The French language uses only one verbal lexeme to build aspectual opposition. The relevant ending is added to theme of the French verb and in this way the lexeme is ”entered” in the appropriate tense. French users need to refer to another tense to show the aspectual opposition.