This chapter primarily focuses on the investigation of denominal verbs' in Paiwan. We would like to address the following questions. How are denominal verbs formed in Paiwan? Can we denominalize all the nouns in Paiwan? lf not what are the constraints on these processes? Are these verbalizing processes productive in
comparison with the corresponding nominalizing processes? In this study?we clarify each type of their denominal uses (as verbs) in terms of word-formation rules; we exemplify how these verbs are similar to or different from ?denominal verbs' and how they are different from other verbs that are derived from nouns via non-focus affixation in Paiwan. In terms of classification of nominal terrns we attempt to explore how human thought and cognition influence these denominalizing processes-what are the conceptual constraints on these processes? We also briefly discuss what mechanisms trigger these denominalizing processes om a pragmatic point of view. Compared with processes of nominalization?we examine the productivity of these denominal verbs and reveal the nature of unmarkedness in processes of denominalization in Paiwan.