1.   His engine was running and his windscreen wipers whipped back and forth to keep the glass clear of snow.

2.   I let the engine run for a minute and then shut it off.

3.   Once the engine is running smoothly, a backfire can be dramatic.

4.   Will this engine run on unleaded fuel?

5.   Is the engine running smoothly?

6.   The engine is running a little rough.

7.   When he got to the car the engine was running and a pall of acrid fumes gathered in the still air.

8.   A hosepipe was attached to the exhaust pipe leading into the interior of the van and the engine was still running.

9.   Its engines were running when I arrived at about four.