3 sentences

1. 他私自贩盐，触犯了当年的朝廷律法。

   tā sī​zì fàn yán, chù​fàn le dāng​nián de cháo​tíng lǜ fǎ.

   He trafficked salt privately, violating the imperial laws of the time.

   Source: Dong Chinese Dictionary

2. 他因为私自挪用公款而被公司开除。

   tā yīn​wèi sī​zì nuó​yòng gōng​kuǎn ér bèi gōng​sī kāi​chú.

   He was fired by the company for misappropriating public funds.

   Source: Dong Chinese Dictionary

3. 这家夜总会的陪酒人员是不允许私自出台的。

   zhè jiā yè​zǒng​huì de péi​jiǔ rén​yuán shì bù yǔn​xǔ sī​zì chū​tái de.

   The escorts at this nightclub are not allowed to go out with customers privately.

   Source: Dong Chinese Dictionary