5 sentences

1. 老师规劝学生要珍惜时间。

   lǎo​shī guī quàn xué​sheng yào zhēn​xī shí​jiān.

   The teacher advised the students to cherish their time.

   Source: Dong Chinese Dictionary

2. 古人认为，当下级发现上级有错时，应当直言规谏。

   gǔ​rén rèn​wéi, dāng xià​jí fā​xiàn shàng​jí yǒu cuò shí, yīng​dāng zhí​yán guī jiàn.

   Ancient people believed that when a subordinate finds a superior to be in error, they should offer direct admonition.

   Source: Dong Chinese Dictionary

3. 我们必须严格遵守校规。

   wǒ​men bì​xū yán​gé zūn​shǒu xiào guī.

   We must strictly abide by the school rules.

   Source: Dong Chinese Dictionary

4. 政府正在进行城市规划。

   zhèng​fǔ zhèng​zài jìn​xíng chéng​shì guī huà.

   The government is working on urban planning.

   Source: Dong Chinese Dictionary

5. 圆规是数学课必备的工具。

   yuán guī shì shù​xué kè bì​bèi de gōng​jù.

   A pair of compasses is an essential tool for math class.

   Source: Dong Chinese Dictionary