05/15/2026
In English, you can say something like “It rained last night” without explaining how you know. Maybe you saw it yourself, maybe someone told you, or maybe you just noticed wet streets in the morning. English leaves that information optional.
But in Quechua, a language spoken across the Andes, grammar actually requires speakers to specify their source of information. This phenomenon is known as evidentiality.
Speakers often have to mark whether they:
personally witnessed something,
heard it from someone else,
or inferred it from evidence.
So instead of simply saying “It rained,” a speaker may effectively be saying:
“It rained (I saw it myself).”
“It rained (someone told me).”
“It rained (I can tell from the evidence).”
What makes this fascinating is that these distinctions are not just optional words like “apparently” or “I heard.” They are built directly into the grammar of the language. Leaving them out can sound unnatural or incomplete.
This changes the way information is communicated socially. Speakers are constantly signaling how reliable or direct their knowledge is, making the difference between firsthand experience, rumor, and inference much more visible in everyday conversation.
Of course, speakers of evidential languages can still lie just like anyone else. The system does not magically make people more truthful. But it does mean that speakers are habitually encouraged to think about the source and certainty of information in a way English speakers often are not.