Which term refers to a participle that indicates completed action?

The term that refers to a participle indicating completed action is the past participle. In English, the past participle is used in various grammatical structures, such as perfect tenses and passive voice. For example, in the sentence "The book has been read," "read" is the past participle, indicating that the action of reading is completed.

This form typically ends in -ed for regular verbs (like "walked" or "played"), although many irregular verbs have unique past participles (like "eaten" or "written"). This completed action characteristic helps convey something that has already occurred relative to the present or another timeframe.

Understanding the distinction between participles is crucial for grasping verb forms and their functions in sentences, especially in constructing accurate and complex sentence structures.