3 sentences

1. 部队正向前方开动。

   bù​duì zhèng xiàng qián​fāng kāi​dòng.

   The troops are moving forward.

   Source: Dong Chinese Dictionary

2. 司机开动了汽车的引擎。

   sī​jī kāi​dòng le qì​chē de yǐn​qíng.

   The driver started the car's engine.

   Source: Dong Chinese Dictionary

3. 菜都上齐了，大家快开动吧！

   cài dōu shàng qí le, dà​jiā kuài kāi​dòng ba!

   All the dishes are served; let's dig in!

   Source: Dong Chinese Dictionary