長年以來關於現代漢語副詞「到底」的語法研究受到學界一定的關注，相關的研究成果十分豐碩。過去的研究多認為「到底」為疑問詞原位，將「到底」與英文中的wh-the-hell或on earth歸為一類，對於脫離疑問詞的「到底」並未有許多深入探討。因此本文主要探討脫離疑問詞的「到底」與疑問詞原位的「到底」在語法─語用介面上，透過語料的分析，找出分辨兩者異同的方法。在語料的分析上，疑問詞的「到底」及脫離疑問詞的「到底」皆又能從中個別細分出兩種不同的語法表現，在語法的位置上，疑問詞的「到底」又稍微高於脫離疑問詞的「到底」，而它們在語用上通常需搭配適當的語境或語氣。
此外，本文也討論了現代漢語副詞中與「到底」相似的其他幾個副詞：終究、畢竟、究竟與根本，分別就語法及語用層面將它們進行整理，並根據整理的表格，找出與「到底」的近似處。另外，本文亦討論了after all、wh-on-earth及wh-the-hell的語法及語用特徵，並比較三者的差異。

The adverb daodi in Mandarin Chinese has long been discussed. In the past, most researches considered daodi as a wh-in-situ word and classified daodi as the same as wh-the-hell or on earth in English. Therefore, this thesis mainly discusses the differences and similarities between the daodi as an interrogative word and the daodi as a non-wh-question in the syntax-pragmatic interface. Moreover, we try to analyze the data and find a way to distinguish these two types. In the data analysis, the daodi as an interrogative word and the daodi as a non-wh-question can be individually subdivided into two different syntactic terms. Regarding syntax position, the daodi as an interrogative word is slightly higher. In order to properly categorize the two different daodi, an appropriate context or tone in pragmatics were provided.
In addition, this thesis also discusses several other adverbs in Mandarin Chinese that are similar to daodi: zhongjiu, bijing, jiujing, and genben. They are analyzed from the syntactic and pragmatic aspects, respectively. According to the sorted table, we found that they were in approximation of daodi. In addition, after all, wh-on-earth, and wh-the-hell were also discussed, and their syntactic and pragmatic features are tabulated.

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