唁函

wǒ gěi tā fā le yī fēng yàn hán

我给他发了一封唁函。

I sent him a letter of condolence.

wǒ jì chū yàn hán yǐ āi dào tā de qù shì

我寄出唁函，以哀悼他的去世。

I sent my sympathies on his death.