嵐(あらし) arashiの noため tame散(さん)歩(ぽ) sanpoに ni行(い)け()な()か()っ()た() ikenakatta。 We couldn't go for a walk because of the storm. Literal Storm [because-of-ため] walk [to-に] go-could-not. 散歩に行く is a fixed collocation ('go for a walk') where に marks the purpose/destination of motion — 'go [for the purpose of] a walk.' The potential negative 行けなかった is the standard 行く→行ける→行けない→行けなかった derivation for u-verbs. weatherdaily life~のため (because of)potential form (~える/~られる)purpose に (verb-stem + に + motion verb)
嵐(あらし) arashiの noため tame散(さん)歩(ぽ) sanpoに ni行(い)け()な()か()っ()た() ikenakatta。 We couldn't go for a walk because of the storm. Literal Storm [because-of-ため] walk [to-に] go-could-not. 散歩に行く is a fixed collocation ('go for a walk') where に marks the purpose/destination of motion — 'go [for the purpose of] a walk.' The potential negative 行けなかった is the standard 行く→行ける→行けない→行けなかった derivation for u-verbs. weatherdaily life~のため (because of)potential form (~える/~られる)purpose に (verb-stem + に + motion verb)