4 sentences

1. 我只是碰巧活了下来。

   wǒ zhǐ​shì pèng​qiǎo huó le xià​lai.

   I just happened to survive.

   Source: OpenSubtitles

2. 那天晚上，我碰巧见到了他。

   nà tiān wǎn​shang, wǒ pèng​qiǎo jiàn​dào le tā.

   That night, I happened to see him.

   Source: OpenSubtitles

3. 我只是碰巧知道我儿子想要什么。

   wǒ zhǐ​shì pèng​qiǎo zhī​dào wǒ ér​zi xiǎng​yào shén​me.

   I just happen to know what my son wants.

   Source: OpenSubtitles

4. 我今天在图书馆碰巧遇到了我的小学老师。

   wǒ jīn​tiān zài tú​shū​guǎn pèng​qiǎo yù​dào le wǒ de xiǎo​xué lǎo​shī.

   I happened to run into my elementary school teacher at the library today.

   Source: Dong Chinese Dictionary