Tā / zài / huì / shàng / xìn / shì / dàn / dàn / de / bǎo / zhèng / huì / àn / shí / wán / chéng / rèn / wù

他在会上信誓旦旦地保证会按时完成任务。

At the meeting, he solemnly promised to finish the task on time.