3 sentences

1. 他正在一个留言板上发帖。

   tā zhèng​zài yī​ge liú​yán​bǎn shang fā tiě.

   He's posting to a message board.

   Source: OpenSubtitles

2. 我从不在网上发帖或回复帖子。

   wǒ cóng​bù zài wǎng​shàng fā tiě huò huí​fù tiě​zi.

   I never post or respond to posts online.

   Source: CCMatrix

3. 在发帖之前，请搜索小组，看看是否有人已经回答了您的问题。

   zài fā tiě zhī​qián, qǐng sōu​suǒ xiǎo​zǔ, kàn​kan shì​fǒu yǒu rén yǐ​jing huí​dá le nín de wèn​tí.

   Before posting, please search the group to see if someone has already answered your question.

   Source: CCMatrix