(9) (chaň / khaw) dii-cai 5 I / he glad 'I am/He is glad.'
when the sentence (21b) above is embedded in a sentence with the third person subject, it becomes apparent that what soo-da precludes is not the first person, but the conceptualizer, which corresponds to the upper/main clause subject as shown in (22) below (modified from Ohye 1975:202).