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Clausal predicate is a sentence predicated by a subject-predicate phrase, it is a very special sentence structure in chinese language. subject-predicate structure serves as predicate, there are two Noun Phrases in front of predicate VP. its structure is very complicated, thematic roles is extremely varied. this paper based on existing research, according to the generation grammar's theory, we tried to study principles and parameters of Clausal predicate in detail, we came to the following conclusions. The subject of Clausal predicate NP1 largely devide into agent and patient. if it isn't a agent and patient, NP1 and NP2 represent the whole and the part, NP2 are subordinate to NP1. NP1 have the various characteristics of a field, for example, age, character, attitude, length, height, weight and so on. besides this type of subject, NP1 also represent a place. Clausal predicate have two Noun Phrase, they lie ahead predicate, if the predicate is a verb, and then it has a object behind itself. when a verb is used in predicate, most of object move forward in the sentence. when we classify Noun Phrase into subject and topic, it is divided into subject and predicate in the deep structure and is divided into topic and comment in the surface structure. the topic is on the far left, it is governed by subject of a sentence. NP1 is a patient, it is originally located behind predicate, it move into TopP's specifier position, it leaves a trace in its original place. when NP1 is a agent, it is a topic, it is located forward NP2. the adverb ‘也’ or ‘都’ are frequently used in front of predicate, it was used for Adjunct, it was added to maximal projection, Adjunct was projected in TP. it is generated in surface structure, it doesn't need to move position, it is merged into the left in tree diagram. a predicate verb mean action, it is a light verb, it constrains the meaning of predicate verb materialize, we can project this like paper <picture2>. Topic can be used by subject itself, it can be also generated by noun phrase movement, we examined the generation of adverb ‘也’ or ‘都’, this facts are the sole phenomenon of chinese, it has the parameter of language.
