3 sentences for 感叹 (gǎn​tàn — lament)

1. 她感叹自己所托非人，婚姻并不幸福。

   tā gǎn​tàn zì​jǐ suǒ tuō fēi​rén, hūn​yīn bìng bù xìng​fú.

   She lamented that she had entrusted herself to the wrong person, and her marriage was unhappy.

   Source: Dong Chinese Dictionary

2. 他常常感叹自己错过了那个大好机会。

   tā cháng​cháng gǎn​tàn zì​jǐ cuò​guò le nà​gè dà​hǎo jī​huì.

   He often laments missing that great opportunity.

   Source: Dong Chinese Dictionary

3. 老人对着旧照片长嗟短叹，感叹时光飞逝。

   lǎo​rén duì​zhe jiù zhào​piàn cháng​jiē​duǎn​tàn, gǎn​tàn shí​guāng fēi​shì.

   The old man sighed over the old photos, lamenting how time flies.

   Source: Dong Chinese Dictionary