父はデジタルカメラの講習を受けに行ったが、あまりの難しさにびっくりしたようだ。 So this sentence is saying, "my dad went to take a short course on digital cameras, but it was difficult to the point of surprising him." Could you say ...
One day, I asked my japanese friend how I could invite some friends to eat. He said "一緒に食べに行くかい？" I know that we could also say: 行きましょうか（行こうか）？ 行きませんか（行かない）？ 行きますか（行くの）？ but I got interested ...
After reading the 2 threads: How to use へ (-e), に (-ni), まで (made) and の方 (no-hō) with destination and direction? and When going somewhere, is there any difference between e (へ) and ni (に)? I would ...