I canceled our last lesson since I was concerned about the approaching typhoon.
I canceled our last lesson since I was worried about the typhoon.
台風の事を考え、こないだのレッスンはキャンセルしました
I canceled our last lesson since I was concerned about the approaching typhoon.
I canceled our last lesson since I was worried about the typhoon.
考え=心配して=concerned/ worried
台風の接近=approaching typhoon.
ぜひ使ってみてください。