stage的過去分詞怎么變化

　　例句：

　　People tend to work hard at this stage of life.

　　人在這個人生階段往往發奮努力。

　　There were more than 50 people on stage in one scene.

　　有一場戲中舞臺上的人有50多個。

　　He staged the most lavish productions of Mozart

　　他組織了一場空前盛大的莫扎特作品演奏會。