N4YouTube

生徒(せいと)間違(まちが)えた(とき)(わたし)はボードに再度(さいど)()いて説明(せつめい)します。

When students make mistakes, I write on the board again to explain.
1 words
For that, yes, when they make mistakes, I write on the board again, like, “For this i-adjective, you don’t put の. の is wrong.”

N5
prt
indicates possessive(occasionally ん, orig. written 乃 or 之)
prt
nominalizes verbs and adjectives