All JLPT grammar

N2

～一方だ

Expresses that a situation or condition is continuing to increase or decrease in one direction.

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At a glance

～一方いっぽうだ means "keeps ~ing" or "more and more". It shows that a change keeps going in one direction, with no sign of stopping.

[Verb (dictionary form)] + 一方だ

物価ぶっかは上あがる一方いっぽうだ。 Prices keep going up.

How to form it

一方だ comes after a verb that expresses change.

Attaches to	How	Example
Verb	Dictionary form + 一方だ	増ふえる一方いっぽうだ
い-adjective	～くなる + 一方だ	寒さむくなる一方いっぽうだ
な-adjective	～になる + 一方だ	便利べんりになる一方いっぽうだ
Noun (as subject)	Noun が + change expression + 一方だ	問題もんだいが深刻しんこくになる一方いっぽうだ

Form	Casual	Polite
Present	一方いっぽうだ	一方いっぽうです
Past	一方いっぽうだった	一方いっぽうでした

Examples

世界せかいの人口じんこうは増ふえる一方いっぽうだ。
The world's population continues to increase.
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The rest of the lesson

When to use it, common mistakes, nuances and a quick check, with spaced repetition to make it stick.

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