tā / zài / rén / mín / xíng / dòng / dǎng / de / jìng / xuǎn / huó / dòng / zhōng / dān / rèn / zhì / yuàn / zhě

他在人民行动党的竞选活动中担任志愿者。

He volunteered in the People's Action Party's election campaign.