FA for the next unfilled place

[Gleki Arxokuna]

{do jinga isefebo mi gleki} <=~ {mi gleki lonu do jinga}

{la frank cu nelci i sefibo la betis cu zmadu la meris} <=~ {la betis cu zmadu la meris lo ni la frank cu nelci ce'u}

The problem here is that one has to use {fe} in the first case and {fi} in the second case. Is there a FA that refers to the next unfilled sumti?