3 sentences

1. 过年时，长辈会给晚辈送红包。

   guò​nián shí, zhǎng​bèi huì gěi wǎn​bèi sòng hóng​bāo.

   During the Lunar New Year, elders give red envelopes to the younger generation.

   Source: Dong Chinese Dictionary

2. 他试图通过送红包的方式来中标。

   tā shì​tú tōng​guò sòng hóng​bāo de fāng​shì lái zhòng​biāo.

   He tried to win the bid by giving red envelopes as bribes.

   Source: Dong Chinese Dictionary

3. 由于今年业绩出色，老板给每个员工都发了红包。

   yóu​yú jīn​nián yè​jì chū​sè, lǎo​bǎn gěi měi gè yuán​gōng dōu fā le hóng​bāo.

   Because of the excellent performance this year, the boss gave every employee a red envelope.

   Source: Dong Chinese Dictionary