write + (past) + why don't you
kaita radou
why don't you; how about doing — a suggestion phrased as a question
meaning: why don't you write
疲れてるなら、少し休んだら？
tsukareteru nara, sukoshi yasundara?
If you're tired, why don't you rest a bit? casual
分からないなら、先生に聞いたらどう。
wakaranai nara, sensei ni kiita radou.
If you don't get it, why don't you ask the teacher? neutral