［kε］ is an auxiliary word and ［iɑη］ is a noun in Xinshao Xiang dialect. As a crossstructure combination, ［kε iɑη］ has gradually become a conjecture auxiliary word in the structure “X+ ［kε iɑη］”, meaning not so confident conjecture which is based on present perception and past perception. The latter also has pragmatic functions such as to seek for further confirmation or to remind the listeners. The coreferential interpretation and ellipsis of center words and modifiers are important motivations and mechanisms during the lexicalization of ［kε iɑη］.