4 sentences

1. 我们每个星期换班一次。

   wǒ​men měi gè xīng​qī huàn​bān yī cì.

   We change shifts once a week.

   Source: Dong Chinese Dictionary

2. 换班的卫兵已经到了，他终于可以下岗了。

   huàn​bān de wèi​bīng yǐ​jīng dào le, tā zhōng​yú kě​yǐ xià​gǎng le.

   The relief guard has arrived, so he can finally go off duty.

   Source: Dong Chinese Dictionary

3. 换班的人还没到，我不能离开。

   huàn​bān de rén hái méi dào, wǒ bù néng lí​kāi.

   The person taking over the shift hasn't arrived yet, so I can't leave.

   Source: Dong Chinese Dictionary

4. 他来换班了，你可以回家休息了。

   tā lái huàn​bān le, nǐ kě​yǐ huí​jiā xiū​xi le.

   He's here for his shift; you can go home and rest.

   Source: Dong Chinese Dictionary