tā / dān / xīn / duì / fāng / yí / dàn / qù / shì / hěn / duō / shì / qing / jiù / huì / sǐ / wú / duì / zhèng

他担心对方一旦去世，很多事情就会死无对证。

He worries that if the other person dies, many matters will have no one left to testify about them.