“na jiao yi ge X” is a subjective sentence pattern which has the function of emphasis. When used in front of the component which has degree differentiation， “na jiao yi ge” can intensify its unusual degree of emphasis; bare verbs can also be put into this sentence pattern by contextual activation and hence the unusual behaviors can be intensified. When used in front of strong or extreme state adjective or its phrase “na jiao yi ge” can emphasize the extremity of the state， and if it is not extreme， the mood can be intensified. “na jiao yi ge X” has undergone a subjective course ，that is ， from “na jiao X” which expresses an objective judgment to the one which has subjective emphasis function and then to “na jiao yi ge X” which has more subjective emphasis function. “na jiao yi ge X” and “zhe jiao yi ge X” display asymmetry in their usage， which may have some relations to their basic usage as demonstrative pronouns.