3 sentences

1. 如果你能帮我办成这件事，事后必有重酬。

   rú​guǒ nǐ néng bāng wǒ bàn​chéng zhè jiàn shì, shì​hòu bì yǒu zhòng chóu.

   If you can help me get this done, there will be a generous reward afterwards.

   Source: Dong Chinese Dictionary

2. 一分耕耘一分收获，天道酬勤是自古不变的真理。

   yī fèn gēng​yún yī fèn shōu​huò, tiān​dào chóu qín shì zì​gǔ bù biàn de zhēn​lǐ.

   No pain, no gain; that God rewards the diligent is an eternal truth.

   Source: Dong Chinese Dictionary

3. 老友寄来一幅画，我正考虑该拿什么礼物去酬他。

   lǎo​yǒu jì​lái yī fú huà, wǒ zhèng kǎo​lǜ gāi ná shén​me lǐ​wù qù chóu tā.

   An old friend sent a painting, and I'm considering what gift to give him in return.

   Source: Dong Chinese Dictionary