3 sentences

1. 他跑得太快，现在直喘气。

   tā pǎo de tài kuài, xiàn​zài zhí chuǎn qì.

   He ran too fast and is now panting.

   Source: Dong Chinese Dictionary

2. 窗外天空阴暗，天气沉闷得让人感到有些喘不过气。

   chuāng wài tiān​kōng yīn'àn, tiān​qì chén​mèn de ràng rén gǎn​dào yǒu​xiē chuǎn bù guò qì.

   The sky outside was gloomy, and the weather was so stifling that it felt almost suffocating.

   Source: Dong Chinese Dictionary

3. 他从小就有喘病，不能剧烈运动。

   tā cóng xiǎo jiù yǒu chuǎn bìng, bù néng jù​liè yùn​dòng.

   He has had asthma since he was a child and cannot engage in strenuous exercise.

   Source: Dong Chinese Dictionary