4 sentences

1. 关键时刻，他决定亲自上阵。

   guān​jiàn shí​kè, tā jué​dìng qīn​zì shàng​zhèn.

   At the critical moment, he decided to take the field himself.

   Source: Dong Chinese Dictionary

2. 如有机会，我一定亲自登府拜访您。

   rú yǒu jī​huì, wǒ yī​dìng qīn​zì dēng fǔ bài​fǎng nín.

   If the opportunity arises, I will certainly visit your home in person.

   Source: Dong Chinese Dictionary

3. 他今天心情很好，决定亲自下厨做几道菜。

   tā jīn​tiān xīn​qíng hěn hǎo, jué​dìng qīn​zì xià​chú zuò jǐ dào cài.

   He is in a great mood today and decided to cook a few dishes himself.

   Source: Dong Chinese Dictionary

4. 面对这种复杂的局面，他决定亲自下场，带领团队解决难题。

   miàn​duì zhè zhǒng fù​zá de jú​miàn, tā jué​dìng qīn​zì xià​chǎng, dài​lǐng tuán​duì jiě​jué nán​tí.

   Faced with this complex situation, he decided to step in personally and lead the team to solve the problem.

   Source: Dong Chinese Dictionary