3 sentences

1. 追思会是为了悼念已故的朋友。

   zhuī​sī​huì shì wèi le dào​niàn yǐ​gù de péng​you.

   The memorial service is held to mourn a deceased friend.

   Source: Dong Chinese Dictionary

2. 许多人参加了这位已故艺术家的追思会。

   xǔ​duō rén cān​jiā le zhè wèi yǐ​gù yì​shù​jiā de zhuī​sī​huì.

   Many people attended the memorial service for the late artist.

   Source: Dong Chinese Dictionary

3. 古代的一些妃嫔会被要求为已故的皇帝陪葬。

   gǔ​dài de yī​xiē fēi​pín huì bèi yāo​qiú wèi yǐ​gù de huáng​dì péi​zàng.

   In ancient times, some concubines were required to be buried with deceased emperors.

   Source: Dong Chinese Dictionary