People want to appear confident. But sometimes it is necessary to say that they do not know exactly.
The researcher learns how to express uncertainty. They use words like "maybe" or "perhaps". These words show that the writer is not certain.
For example, in a letter to a supervisor, one might write "perhaps the reason is this". This is better than false certainty.
Why is this important? Writers want to be honest. They want to say when they do not know exactly. This helps readers.
In academic work, the text must be clear. But sometimes it is necessary to say "I do not know exactly". This is honest.
Young writers use these words more. Experienced writers use them less. In English, it is different.
Computers cannot say "I don't know". This is a problem. The researcher wants to know how people understand uncertainty.
Summary: be honest. Say when you do not know exactly.