2 sentences for 份子 (fèn​zi)

1. 去参加老同学的婚礼，这份份子是一定要随的。

   qù cān​jiā lǎo tóng​xué de hūn​lǐ, zhè fèn fèn​zi shì yī​dìng yào suí de.

   When attending an old classmate's wedding, giving a monetary gift is a must.

   Source: Dong Chinese Dictionary

2. 咱们几个人凑个份子，给退休的老张买件礼物吧。

   zán​men jǐ gè rén còu gè fèn​zi, gěi tuì​xiū de lǎo Zhāng mǎi jiàn lǐ​wù ba.

   Let's pool our money to buy a gift for retired Lao Zhang.

   Source: Dong Chinese Dictionary