In this paper, we have discussed $quot;Existential/Presentational Sentences$quot; and $quot;Sentences Without Subject$quot; in Mandarin Chinese, based on Ergative Hypothesis which was first proposed by Perlmutter (1978) and later incorporated into Government and Binding Theory by Burzio (1981, 1986). Ergative Hypothesis claims that there are two classes of intransitive verbs - unergatives and ergatives - each associated with a distinct syntactic configuratiosn in the following way: Unergative verbs: [IP NP [vp V ]] Ergative verbs: [IP [vp V NP ]] Semantically, ergative verbs tend to be associated with the meanings of existence, appearance, disappearance, spatial configuration, motion, emission, change of state. Throughout the paper, we have corroborated that syntactic configurations of Existential/Presentational Sentences arid Sentences Without Subject display those of ergative verbs and the verbs appearing in these constructions are restricted to those which have meanings attributed to the semantics of ergative verbs studied by Levin and Rappaport (1995).