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Which special verb forms occur in Lithuanian but not in Latvian?

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In the context of the Baltic languages, Lithuanian is distinguished from Latvian by the presence of a frequentative past tense.

While both languages share many morphological features, this specific verb form allows Lithuanian to express habitual actions in the past—for example, jie eidavo ("they used to go") or kirsdavau ("I used to cut, strike"). Conversely, Latvian features a unique debitive verb form (e.g., man ir jāmācās, meaning "I must study" or "it is necessary for me to study") that is not found in Lithuanian.1