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it means he is not ..Iam not ..she is not ...have not ....has not ....are not...
( is not & are not )
ex ; this ain t my shirt
No of course it ain.'t
Drochrath air! (Damn it!)
Is cuma sa diabhal liom. (I don't care a damn.)
Dheamhan dada (Not a damn thing)
No, it ain´t.
damn thing