The syntactic construction of NP₁ be NP₂ in English involves a compatibility relation between the logical extensions of concept NP₁(subject) and concept NP₂(predicate).By using abstract nouns in NP₁ and NP₂,this syntactic construction expresses semantic meaning of generalization,objectivity and static property.A key to better understanding of this syntactic pattern is the back-transformation of abstract nouns to concrete expressions.Depending on the semantic expressions of two nominal phrases NP₁ and NP₂,the construction of NP₁ be NP₂ may be translated into different types of Chinese sentence structure such as "shi" sentence,sentence with transitive verbs or intransitive verbs,sentence with adjective predicate and non-subject-sentence.