There are mainly three reasons of the exchanging of subject and object :the agent-patient relationship of subject and object is vague, the features of semantic roles are not very typical;
主宾互易的原因从总体上看主要有三个方面：主宾语施受关系模糊，语义角色的特征不是十分典型；
The characteristic of agent-object clause with one-way verb is that there is an agent relationship between the verb and the noun which follows the verb;
双向动词施事宾语句的特点是动词后的名词性成分与动作动词及句首的名词性成分之间有施动受关系。
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