Vitron isn't hiding anything. The oil is there, the books are open, everything tracks.

Within the framework of a distinction between grammatical and lexical aspect, the category grammatical aspect, which is usually realized in the morphology of the verb, includes the imperfective and the perfective aspect, whereas the lexical aspect concerns the situation types (Aktionsarten) of the verb, i.e. it is inherent to the semantics of the verb.

Paul is supposed to call his mother every day.

a mouseless house