本論文旨在探討「掉」出現在動詞後面時的語意內涵與語法地位。我們認為當「掉」身為結果補語時，它的意思為「被往下移除」；身為動相標誌時，意思為「被移除」；身為動貌標誌時，則標示起始意。「掉」經常與及物和非作格動詞形成複合動詞：與靜態動詞、瞬間動詞及達成動詞構成達成複合動詞，與動作動詞及完成動詞則構成完成複合動詞。雖然V-掉的論元結構經常是其前置動詞與「掉」之論元結構的結合體，但在某些情況下「掉」可能會壓制前置動詞的論元、幫V-掉複合動詞增加新論元或先壓制前置動詞的論元再幫V-掉複合動詞增加新論元。最後，我們採用虛化的理論來解釋為何「掉」具有多重語意及多重語法地位。由於「掉」符合Hopper (1991)所提出的虛化原則，因此我們相信「掉」的確正處在虛化的過程中。 / There are two main questions about post-verbal diao we dealt with in the present study: one is its meanings, and the other is its syntactic status. We argue that when diao acts as a resultative complement, it means ‘to be removed in a downward direction’, when it acts as a phase marker, it means ‘to be removed’, and when it acts as an aspect marker, it bears a grammatical meaning indicating inchoative. Post-verbal diao usually co-occurs with transitive and unaccusative verbs to form compounds. When diao goes with State, Semelfactive and Achievement verbs, the V-diao compounds will be Achievements, when diao goes with Activity and Accomplishment verbs, the V-diao compounds will be Accomplishments. In most cases, the argument structure of a V-diao compound is a composition of the argument structure of the preceding verb and that of diao. However, diao will suppress the Goal argument when co-occurring with three-place transactional verbs; it will create an argument for the V-diao compound when the argument of the preceding verb and that of diao are incompatible; it will suppress an argument of the preceding verb and create a new one for the V-diao compound when occurring with verbs which have an incremental theme. Grammaticalization is taken to account for the polysemy and the multiple syntactic status of post-verbal diao. Because except specialization, diao follows all of the principles (i.e. Layering, Divergence, Persistence, and De-categorialization) proposed by Hopper (1991), we suggest it is in the process of grammaticalization.