Columbia subject headings:
Polish language--Grammaticalization.
Polish language--Tense.
Polish language--Usage.
Polish language--Verb.
Harvard subject headings:
Polish language--Grammaticalization.
Polish language--Tense.
Polish language--Usage.
Polish language--Verb.
Princeton subject headings:
Polish language--Grammaticalization.
Polish language--Tense.
Polish language--Usage.
Polish language--Verb.