4 sentences

1. 凯先生在这一带很有名。

   Kǎi xiān​sheng zài zhè yī​dài hěn yǒu​míng.

   Mr. Kai is very famous in this area.

   Source: Dong Chinese Dictionary

2. 将军带着士兵们凯旋而归。

   jiāng​jūn dài zhe shì​bīng men kǎi xuán ér guī.

   The general and his soldiers returned in triumph.

   Source: Dong Chinese Dictionary

3. 他在笔记本上写下了一个希腊字母凯。

   tā zài bǐ​jì​běn shàng xiě​xià le yī gè Xī​là zì​mǔ kǎi.

   He wrote down the Greek letter Chi in his notebook.

   Source: Dong Chinese Dictionary

4. 他今天表现得很凯，请全公司的人喝下午茶。

   tā jīn​tiān biǎo​xiàn de hěn kǎi, qǐng quán gōng​sī de rén hē xià​wǔ chá.

   He was very generous today and treated the whole company to afternoon tea.

   Source: Dong Chinese Dictionary