Used as an interjection to indicate that one has just realized or understood something, similar to "oh" or "I see".

A sentence-final particle used to convey warmth, intimacy, or friendliness; it can also signal that one is sharing a fact the listener might not know

Used as an interjection to express surprise, doubt, or disbelief, often meaning "really?" or "is that so?".

(bound form) to softly chant or recite poetry with cadence