7 sentences

1. 别开玩笑了，咱们说正事吧。

   bié kāi​wán​xiào le, zán​men shuō zhèng​shì ba.

   Stop joking; let's talk about serious business.

   Source: Dong Chinese Dictionary

2. 正经点儿，我们在谈正事呢。

   zhèng​jīng diǎn r, wǒ​men zài tán zhèng​shì ne.

   Be serious; we are talking about important business.

   Source: Dong Chinese Dictionary

3. 咱们别光说闲话，谈谈正事吧。

   zán​men bié guāng shuō xián​huà, tán tán zhèng​shì ba.

   Let's stop chatting and talk about business.

   Source: Dong Chinese Dictionary

4. 你别在那儿卖乖了，快去干正事。

   nǐ bié zài nà​r mài guāi le, kuài qù gàn zhèng​shì.

   Stop showing off there and get to work.

   Source: Dong Chinese Dictionary

5. 别说废话了，我们还是谈正事吧。

   bié shuō fèi​huà le, wǒ​men hái​shi tán zhèng​shì ba.

   Stop talking nonsense; let's get down to business.

   Source: Dong Chinese Dictionary

6. 我们只是在说闲话，没谈什么正事。

   wǒ​men zhǐ​shì zài shuō​xián​huà, méi tán shén​me zhèng​shì.

   We were just making small talk, not discussing anything serious.

   Source: Dong Chinese Dictionary

7. 你千万别因为这点小事耽误了正事。

   nǐ qiān​wàn bié yīn​wèi zhè diǎn xiǎo​shì dān​wu le zhèng​shì.

   You must not let such a small matter interfere with the main business.

   Source: Dong Chinese Dictionary