1. tuah duhmi , tinhmi , tuah khawh; e.g. Water is effective in extinguishing fires = Mei hmihnak ah ti cu san a tlai;
2. ttuan hram i thawk; e.g. An act of parliament is effective as soon as the president signs it = Parliament nih upadi an sermi cu haotu bik nih a min a thut cangka in rianttuan hram aa thawk.