此篇文章以附加語的句法特質為出發點，提出語言事實以及概念上的論點來反駁Kayne（2013）反對生成語法中有方向參數的其中兩個主要論點，並提出幾個未來可行的研究方向。首先，我指出Whitman（2005）對韓語的SONegV 語序的觀察分析並非方向參數的反證，因為此分析無法解釋某些範域的現象，同時，我們不難找到符合方向參數的分析來解釋此語序的存在。接著我指出Carstens（2002）和Kayne 對於連動結構的分析也非方向參數的有效反證，因為連動結構在不同語言中動詞語序不同，不符合他們的描述，且右向附加語的分析更能處理這些語料。另外，我也整理出附加語關於方向的句法特質，做為證明方向參數的額外論點。

In this article, I offer some empirical and conceptual arguments against two of Kayne’s (2013) main arguments against directionality parameters in the generative grammar framework, and sketch some alternative directions for future research, with a special focus on adjuncts. I will first show that the SONegV order in Korean observed by Whitman (2005) is not a valid argument against directionality parameters, because his analysis fails to account for certain scopal facts; and even if the scopal facts are not an issue, alternative analyses can be found without resorting to movement. Next I will show that facts about serial verb constructions do not constitute valid arguments against directionality parameters either. Contra Carstens (2002) and Kayne, I show that SVCs are not cross-linguistically constant with respect to the relative order of the verbs, and that an approach that allows right-adjunction can better capture the facts. In addition, I show that adjuncts have some unique syntactic properties with respect to directions that further corroborate the need for directionality parameters in grammar.