I hadwas attending drone courses for three days. These courses talking aboutwere introductory course on drones, their uses and operation. I was attending drone courses for three days. These courses were introductory course on drones, their uses and operation.

I hadtook drone courses for three days. The courses talking about introductory course onincluded an introduction to drones, their uses, and their operation. I took drone courses for three days. The courses included an introduction to drones, their uses, and their operation.

I had drone courses forattended a three -days The courses talking about introductory course on drones, covering their uses and operation. I attended a three-day introductory course on drones, covering their uses and operation.