4 sentences

1. 政府正在拆除老城区的危房。

   zhèng​fǔ zhèng​zài chāi​chú lǎo chéng​qū de wēi​fáng.

   The government is demolishing dilapidated buildings in the old city district.

   Source: Dong Chinese Dictionary

2. 施工队正在拆除混凝土墙的模板。

   shī​gōng​duì zhèng​zài chāi​chú hùn​níng​tǔ qiáng de mú​bǎn.

   The construction crew is removing the formwork from the concrete wall.

   Source: Dong Chinese Dictionary

3. 为了扩建马路，这些老房子必须被拆除。

   wèi​le kuò​jiàn mǎ​lù, zhè​xiē lǎo fáng​zi bì​xū bèi chāi​chú.

   To widen the road, these old houses must be demolished.

   Source: Dong Chinese Dictionary

4. 演出结束后，工人们迅速拆除了舞台上的音响设备。

   yǎn​chū jié​shù hòu, gōng​rén men xùn​sù chāi​chú le wǔ​tái shàng de yīn​xiǎng shè​bèi.

   After the performance, workers quickly dismantled the sound equipment on stage.

   Source: Dong Chinese Dictionary