Most fascinating is a feature that would make any journalist tremble. Tuyuca requires verb-endings on statements to show how the speaker knows something. Diga ape-wi means that “the boy played soccer (I know because I saw him)”, while diga ape-hiyi means “the boy played soccer (I assume)”. English can provide such information, but for Tuyuca that is an obligatory ending on the verb. Evidential languages force speakers to think hard about how they learned what they say they know.
We went in search of the world’s hardest language
The Economist

These are known as evidentials. I use them in Macedonian and I know that Turkish uses this construction as well. Evidentials are productive, meaning that they are in frequent use and a useful in conversation, writing, etc. (I should note that I did an undergrad and MA in Linguistics).

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