6 sentences

1. 是啊，时光飞逝啊，对吗？

   shì a, shí​guāng fēi​shì a, duì ma?

   Yeah, time flies, huh?

   Source: OpenSubtitles

2. 坏消息是时光飞逝。

   huài xiāo​xi shì shí​guāng fēi​shì.

   The bad news is that time flies.

   Source: OpenSubtitles

3. 时光飞逝，对吧？

   shí​guāng fēi​shì, duì ba?

   Time flies, huh?

   Source: OpenSubtitles

4. 时光飞逝，我们要珍惜当下的每一秒。

   shí​guāng fēi​shì, wǒ​men yào zhēn​xī dāng​xià de měi yī miǎo.

   Time flies; we should cherish every second of the present.

   Source: Dong Chinese Dictionary

5. 时间飞逝，转眼间我们已经毕业十年了。

   shí​jiān fēi​shì, zhuǎn​yǎn jiān wǒ​men yǐ​jīng bì​yè shí nián le.

   Time flies; it's already been ten years since we graduated.

   Source: Dong Chinese Dictionary

6. 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