The speaker's attitudes and intentions
Source of knowledge
How the speaker knows
How does the speaker know?
பொருள்
A signal that marks whether information is seen, heard, inferred, assumed, reported, remembered, or generally known.
இதைக் கண்டறிவது எப்படி
Ask whether the sentence shows the source of knowledge.
Visual guide
claim: the train is late
^
evidence layer:
how does speaker know?
I heard / it seems / apparently
Apparently, the train is late.