He was controlling traffic using hand signals as a traffic police officer.

The ship entered the port flying a quarantine flag.

My father bought a new excavator.

He solved complex mathematical problems using his new calculator.

My new vacuum cleaner is very quiet.

I can't afford to miss this opportunity.

The transmission of this car is very smooth.

My new computer is very fast.

He is fulfilling his responsibility as a president who controls state affairs.

My father is an aircraft pilot.