2 sentences for 落 (là — lag behind)

1. 他没吃早饭，跑了几圈就落到后面了。

   tā méi chī zǎo​fàn, pǎo le jǐ quān jiù là dào hòu​mian le.

   He skipped breakfast, so he fell behind after running a few laps.

   Source: Dong Chinese Dictionary

2. 他性格很要强，凡事都不愿落在别人后面。

   tā xìng​gé hěn yào​qiáng, fán​shì dōu bù yuàn là zài bié​ren hòu​mian.

   He is very competitive and never wants to fall behind others.

   Source: Dong Chinese Dictionary