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本文就情态动词＋不定式完成体的用法和意义进行了比较研究，通过归类、比较和举例阐述了不同情态动词在这一结构中的不同用法特征．
This paper makes a comparative study on the usage and significance of the modal verb + infinitive, and expounds the different usage characteristics of different modal verbs in this structure through the classification, comparison and examples.