2 sentences

1. 这件事发生在前，你可能已经不记得了。

   zhè jiàn shì fā​shēng zài​qián, nǐ kě​néng yǐ​jīng bù jì​de le.

   This happened earlier; you might not remember it anymore.

   Source: Dong Chinese Dictionary

2. 由于他的名字排在前，因此需要由他先开始自我介绍。

   yóu​yú tā de míng​zi pái zài​qián, yīn​cǐ xū​yào yóu tā xiān kāi​shǐ zì​wǒ jiè​shào.

   Since his name is at the top of the list, he needs to start the self-introductions.

   Source: Dong Chinese Dictionary