完成 (wán chéng) is a compound verb meaning 'to complete' or 'to accomplish'—it emphasizes the successful finishing of a task, project, or goal. The first character 完 (wán) means 'entire' or 'finished', and the second 成 (chéng) means 'to succeed' or 'to become'. Together, they convey the idea of bringing something to a successful conclusion. It’s commonly used in formal and neutral contexts—such as work reports, school assignments, deadlines, and personal goals—and often appears with objects like 任务 (rènwù, 'task'), 作业 (zuòyè, 'homework'), or 计划 (jìhuà, 'plan').

This verb is transitive: it requires a direct object and is frequently followed by aspect particles like 了 (le) to indicate completion, or by complements like 得很好 (de hěn hǎo, 'very well') to describe how the action was performed. While it can be used alone, it rarely stands without an object in natural speech—saying just '我完成了' sounds incomplete unless context clearly implies what was finished.