2 sentences for 哀悼 (āi​dào — mourning)

1. 请接受我们对您家人的深切哀悼。

   qǐng jiē​shòu wǒ​men duì nín jiā​rén de shēn​qiè āi​dào.

   Please accept our deepest condolences for your family.

   Source: Dong Chinese Dictionary

2. 在新加坡，出席葬礼通常会送白金以示哀悼。

   zài Xīn​jiā​pō, chū​xí zàng​lǐ tōng​cháng huì sòng bái​jīn yǐ shì āi​dào.

   In Singapore, it is customary to give 'pek kim' at funerals to express sympathy.

   Source: Dong Chinese Dictionary