3 sentences

1. 你又在做白日梦了。

   nǐ yòu zài zuò bái​rì​mèng le.

   You're daydreaming again.

   Source: OpenSubtitles

2. 他在做白日梦。

   tā zài zuò bái​rì​mèng.

   He is daydreaming.

   Source: Tatoeba

3. 别再做白日梦了，脚踏实地努力吧。

   bié zài zuò bái​rì​mèng le, jiǎo​tà​shí​dì nǔ​lì ba.

   Stop daydreaming and work hard with your feet on the ground.

   Source: Dong Chinese Dictionary