Says I …
Arsa mise …
We often hear the gnìomhair neo‑iomlan (defective verb): arsa (said) used by people who are reciting stories or reporting what they, or someone else said.
This is like the old fashioned: 'says/said I', 'says/said he' or 'says/said she' used when recounting what was said. Think of 'he said, she said'!
There is only the one past tense form; this verb can't be used as a question or negative statement; and it does not have a future or conditional tense.
'Thalla dhachaigh,' ars' am bodach.
'Away home,' says the old man.
'Dèan thusa na thogras tu,' arsa mise ris.
'You do as you please,' says I to him.