4 sentences

1. 他立志为民除害，锄奸扶弱。

   tā lì​zhì wèi mín chú​hài, chú jiān fú​ruò.

   He is determined to eliminate evils for the people, rooting out traitors and helping the weak.

   Source: Dong Chinese Dictionary

2. 军队内部出了一个奸，泄露了重要机密。

   jūn​duì nèi​bù chū le yī gè jiān, xiè​lù le zhòng​yào jī​mì.

   A traitor emerged within the army and leaked important secrets.

   Source: Dong Chinese Dictionary

3. 那人性格极奸，你平时要多留个心眼。

   nà rén xìng​gé jí jiān, nǐ píng​shí yào duō liú gè xīn​yǎn.

   That person is extremely treacherous; you should be more cautious.

   Source: Dong Chinese Dictionary

4. 他们二人私通，勾搭成奸，被众人撞见了。

   tā​men èr rén sī​tōng, gōu​da chéng jiān, bèi zhòng​rén zhuàng​jiàn le.

   The two of them had an affair and were caught in the act of adultery.

   Source: Dong Chinese Dictionary