This article aims to account for the syntactic structure of a passive sentence within Principles and Parameters(=PP) theory and Minimalist theory of Chomsky. According to PP-theory, as the inflectional ending morpheme -en of passive verb absorbs the θ-role assigned to the subject NP of a passive sentence, the subject position at D-structrue is empty. The object NP of passive verb moves to the non-θ-position of the subject in S- structure because -en absorbs the objective Case assigned to the object NP. In Minimalist theory the syntactic property of a passive sentence is characterized by a single complement hypothesis, or the lexical structure representation of an unergative verb in shell structure and of a de-adjectival verb in inner structure. In the inner structure the complement of a head V is projected by the de-adjectival verb. This de-adjectival verb assigns a θ-role theme to the specifier NP of VP through predication relation. The NP of inner Spec position moves to the Spec position of AGRsP to be checked against tense and Case feature. The tense verb be selected as the head V of the shell structure also moves to the AGRs position of AGRsP to be checked against tense and agreement feature of functional heads. This morphological feature checking is operated through Spec-head or head-head agreement before Spell-out.

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