～いっぽうだ
ippou da
Keep becoming; steadily more
N2JLPT
Formation 接続
V（辞書形）+一方だ
Full formation notes
V（辞書形） + 一方だ
Nの + 一方だ
Explanation 説明
Describes a continuing trend in one direction, often an unwelcome one; not a contrast between two sides.
Examples 例文
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会議の費用は増える一方だ。
The cost of the meeting keeps rising.
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試験の費用は増える一方だ。
The cost of the exam keeps rising.
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研修の費用は増える一方だ。
The cost of the training session keeps rising.
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発表会の費用は増える一方だ。
The cost of the presentation event keeps rising.
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面接の費用は増える一方だ。
The cost of the interview keeps rising.
How related patterns differ 比較
つつ often joins actions by one subject; つつも concedes. かたわら links sustained pursuits. てからというもの marks a turning point; つつある an ongoing change, 一方だ a one-way trend, and おきに a recurring interval.
| Pattern | Meaning | Example |
|---|---|---|
| ～いっぽうだ | Keep becoming; steadily more | 会議の費用は増える一方だ。 The cost of the meeting keeps rising. |
| ～つつ | While doing; although | 資料を確認しつつ、気づいた点をメモした。 While checking the documents, I noted the points that caught my attention. |
| ～つつある | Be gradually becoming; be in the process of | 日本語への関心が高まりつつある。 Interest in Japanese is gradually growing. |
| ～つつも | Although; despite being aware of | 早く寝ようと思いつつも、つい本を読んでしまいました。 Although I intended to sleep early, I ended up reading. |
| 〜かたわら | While also; alongside | 会社で働くかたわら、研究を続けている。 Alongside my job at a company, I continue with research. |
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