Stress can also differentiate otherwise identical voice morpheme strings: tú:mu:- causative reflexive (get someone else to do/make one) from tu:mú:-(1) the causative of making oneself seem, or pretend to be in some state, and tu:mú:-(2) the circumstantial (tu:- allomorph before m-) of same (i.e. to seem/pretend at any specified time or place, with any particular tools, for any reasons, etc.). Circumstantial T has different allomorphs- some having following stressable vowel, others not- this also complicates matters for the learner but may also help disentangle morpheme boundaries for the listener.