| 英文摘要 |
This study investigates the distinction between English middle constructions in determinative and appositive relative clauses. The objective is to examine the behavior of middles within subordinate clauses by analyzing their sentential positions and structural characteristics to identify influencing factors. The presence of an arbitrary agent and the pragmatically oriented structure of middles were found to influence their sentential positions. Data from the COCA corpus reveals frequent occurrences of middles in both types of relative clauses, particularly sentence-initially and sentence-finally, with a higher frequency at final positions. Determinatives, likely indefinite, are more common in final positions, while appositives, likely definite, occur frequently in both initial and final positions. The study concludes that the appearance of these constructions is primarily influenced by information structure, definiteness, informativeness, at-issueness, and clausal structure. Additionally, informativeness and at-issueness were found to affect the obligatoriness of determinative relative clauses. The distinctive feature of middles lies in the arbitrary agent, which not only facilitates their appearance sentenceinitially but also shapes the context. This study is the first comparative study of relative clauses with a specific sentence structure. |