4 sentences

1. 他屡次违反校规，受到了警告。

   tā lǚ​cì wéi​fǎn xiào​guī, shòu​dào le jǐng​gào.

   He was warned for repeatedly violating school rules.

   Source: Dong Chinese Dictionary

2. 必须严肃处理违反校规的行为。

   bì​xū yán​sù chǔ​lǐ wéi​fǎn xiào​guī de xíng​wéi.

   Violations of school rules must be dealt with seriously.

   Source: Dong Chinese Dictionary

3. 他因为违反校规受到了学校的处分。

   tā yīn​wèi wéi​fǎn xiào​guī shòu​dào le xué​xiào de chǔ​fèn.

   He was disciplined by the school for violating the school rules.

   Source: Dong Chinese Dictionary

4. 每一个学生都应该自觉遵守学校的校规。

   měi yī gè xué​sheng dōu yīng​gāi zì​jué zūn​shǒu xué​xiào de xiào​guī.

   Every student should consciously abide by the school rules.

   Source: Dong Chinese Dictionary