stage的过去分词怎么变化

例句：

People tend to work hard at this stage of life.

人在这个人生阶段往往发奋努力。

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

有一场戏中舞台上的'人有50多个。

He staged the most lavish productions of Mozart

他组织了一场空前盛大的莫扎特作品演奏会。