5 sentences

1. 邮递员正在送信。

   yóu​dì​yuán zhèng​zài sòng xìn.

   The mail carrier is delivering letters.

   Source: Dong Chinese Dictionary

2. 邮递员正在挨家挨户送信。

   yóu​dì​yuán zhèng​zài āi​jiā'āi​hù sòng​xìn.

   The mailman is delivering mail door-to-door.

   Source: Dong Chinese Dictionary

3. 邮递员把信放进了门口的信箱。

   yóu​dì​yuán bǎ xìn fàng​jìn le mén​kǒu de xìn​xiāng.

   The mail carrier put the letter in the mailbox at the door.

   Source: Dong Chinese Dictionary

4. 邮递员送来了一个沉甸甸的包裹。

   yóu​dì​yuán sòng​lái le yī gè chén​diàn​diàn de bāo guǒ.

   The mailman delivered a heavy package.

   Source: Dong Chinese Dictionary

5. 邮递员每天下午都会准时来送邮件。

   yóu​dì​yuán měi tiān xià​wǔ dōu huì zhǔn​shí lái sòng yóu​jiàn.

   The mailman comes to deliver the mail punctually every afternoon.

   Source: Dong Chinese Dictionary