4 sentences

1. 有时候我分不清梦境和现实。

   yǒu shí​hou wǒ fēn bu qīng mèng​jìng hé xiàn​shí.

   Sometimes, I can't distinguish between dreams and reality.

   Source: OpenSubtitles

2. 我永远分不清你是不是说真的。

   wǒ yǒng​yuǎn fēn bu qīng nǐ shì​bu​shì shuō zhēn​de.

   I can never tell when you're being serious.

   Source: OpenSubtitles

3. 在游行队伍中很难分清谁是谁。

   zài yóu​xíng duì​wu zhōng hěn nán fēn qīng shéi shì shéi.

   It is hard to tell who is who in the parade.

   Source: UM-Corpus: Education

4. 你们的任务就是分清楚哪个是哪个。

   nǐ​men de rèn​wu jiù​shì fēn qīng chǔ nǎ​ge shì nǎ​ge.

   Your job is to know which is which.

   Source: UM-Corpus: Subtitles