Problem with Contains

enter code hereOkay so I'm trying to make a small translator for a school project. But for some reason in 1 function String.Contains does work correctly and in the other it doesn't.

 var PvTrans : String[] = ["Zijn-are","Gaan-go","ben-am","bent-are","is-is","ga-go", "gaat-goes"];


 function VertaalPV()
 
     {
         for (var Persv : String in PvTrans)
         {
             if (Persv.Contains(PV))
             {
                 NedEng = Persv.Split("-"[0]);
                 VertaaldeTekst += NedEng[1] + " ";
             }
         }
     }

If PV = Gaan; It doesn't translate(infact it doesn't run anything in the if statement)

The working function:

 function Vertaal()
     {
         for (var OND : String in MvTrans)
         {
                 if (OND.Contains(Ond))
                 {
                     NedEng = OND.Split("-"[0]);
                 }
                 else
                 {
                     for (var OND : String in EvTrans)
                         {
                             if (OND.Contains(Ond))
                             {
                                 NedEng = OND.Split("-"[0]);
                             }    
                         }
                 }
         }
     }

But if it is something else(from the same list) it does work. Any idea what is causing the problem?