Columbia subject headings:
Bulgarian language--Tense.
Contrastive linguistics.
French language--Tense.
Russian language--Tense.
Harvard subject headings:
Bulgarian language--Tense.
French language--Tense.
Grammar, Comparative and general--Verb.
Russian language--Tense.
Princeton subject headings:
Bulgarian language--Tense.
Contrastive linguistics.
French language--Tense.
Russian language--Tense.