Someone or something (ma-) is certain, sure of something.
also syirto
segurado
tiyák
Masyirto ko a myan a tabo dyimo nyaya.
I am sure that you have all these.
Masyirto aba a mayam iyaw lampitaw sichangori, ta masalawsaw.
It is not sure that the outrigger boat goes today, because it is windy.
Syirto iyaw kapagbyahi ko.
My voyage is certain.
Someone (mang-) makes certain, sure of something (-en).
-en syirtowen
Syirtowen mo a dyi mo yamen a allilawen dana mirwa.
Make sure that you do not deceive us again.