一方だ
Meaning
Keeps on getting more and more …; a change continues steadily in one direction without reversing.
Conjugation
Vる + 一方だ: Vる + 一方の + N
Examples
Show translation
物価は上がる一方だ。
休みなしで働いているせいで、体の調子が悪くなる一方だ。
日本では、子どもの数が減る一方だ。
増える一方の仕事にうんざりしている。
病気になってから、父の体は弱る一方だ。
彼は毎月カードで買い物をして、借金を増やす一方だ。
grammarDetailPage.commonMistakes.title
grammarDetailPage.commonMistakes.wrong: 休みの日は家でアニメを見る一方だ。
grammarDetailPage.commonMistakes.correct: 休みの日は家でアニメを見てばかりいる。
grammarDetailPage.commonMistakes.why: 一方だ needs a verb expressing a change that continues in one direction. Both intransitive and transitive verbs of change can be used. However, it cannot simply mean 'I only/keep doing an activity'; use ばかり or 〜続ける for that.
grammarDetailPage.commonMistakes.wrong: 人口が増えた一方だ。
grammarDetailPage.commonMistakes.correct: 人口が増える一方だ。
grammarDetailPage.commonMistakes.why: 一方だ attaches to the dictionary form (Vる) to show an ongoing trend. The past form is not used.
grammarDetailPage.commonMistakes.wrong: 景気が悪い一方だ。
grammarDetailPage.commonMistakes.correct: 景気が悪くなる一方だ。
grammarDetailPage.commonMistakes.why: The pattern follows a verb that expresses change. A state adjective like 悪い cannot be used directly; use 悪くなる.
Key points
Used with verbs of change (増える, 減る, 悪くなる, 上がる, 弱る) to describe a trend that keeps progressing, most often a bad or worrying one, but neutral or positive trends are possible. Transitive verbs expressing a continuing change can also be used (e.g., 借金を増やす一方だ). It cannot simply express the continuation or repetition of an activity ('I will keep doing X'); use 〜続ける for that. It is different from 一方で ('while / on the other hand'), which contrasts two facts.
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