Just a point I'm curious about. In 1.14 I saw the expression “par train” to mean “by train”, “par voiture” to mean “by car”, etc.
I also use Duolingo in parallel to Rocket French and they taught the expression, “en train”, “en voiture”, etc.
Are both valid, or is “par train” etc the more valid use? I tend to trust Rocket French more than Duolingo but wanted to know about this difference.