According to the semantic characteristics, verbs can be classified into action verb, state verb, relation verb and modal verb.
按语义特征将其分为动作动词、状态动词、关系动词和能愿动词四类。
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This paper discusses the basic concepts of variant degrees of modal verbs and puts forward that in the realization of modal meaning modal verbs can present variant degrees of semantic choice.
Semantic the difference exists primarily on the statement object, object movement, focusing on action, action occurred extent, the use of tools and action moves modal area.