4 sentences for 认定 (rèn​dìng — determine)

1. 警方认定他是单独作案。

   jǐng​fāng rèn​dìng tā shì dān​dú zuò'àn.

   The police determined that he acted alone.

   Source: Dong Chinese Dictionary

2. 这起火灾被认定为蓄意纵火。

   zhè qǐ huǒ​zāi bèi rèn​dìng wéi xù​yì zòng​huǒ.

   This fire was determined to be a case of deliberate arson.

   Source: Dong Chinese Dictionary

3. 法院认定该行为属于正当防卫。

   fǎ​yuàn rèn​dìng gāi xíng​wéi shǔ​yú zhèng​dàng fáng​wèi.

   The court ruled that the act was a case of justifiable self-defense.

   Source: Dong Chinese Dictionary

4. 他在遭到歹徒袭击时奋力还击，被法院认定为正当防卫。

   tā zài zāo​dào dǎi​tú xí​jī shí fèn​lì huán​jī, bèi fǎ​yuàn rèn​dìng wéi zhèng​dàng fáng​wèi.

   He fought back when attacked by a thug, and the court ruled it as self-defense.

   Source: Dong Chinese Dictionary