pu particle in an indirect question: what, how, why comment, combien, pourquoi, ce que ... suivant une proposition négative U kan ndaan aah bii pu na. She saw how the pito had spoiled. Baa nyi baah ga ŋa pu na. They did not know what they would do. Maa nyi budabu pu u wii na. I don't know why he is crying