〜ことになる

〜ことになる is a verb form expressing it turns out that ~. Understanding this conjugation pattern is essential for expanding what you can express in Japanese. Verb forms are the backbone of Japanese grammar — each form unlocks new ways to describe actions, states, and intentions.

This is an intermediate pattern used regularly in everyday Japanese conversation and writing.

When to Use#

• When announcing a decision that was made by others or circumstances
• When reporting an outcome that was beyond your control

When NOT to Use#

• When the meaning is closer to "decide to ~" — use 〜ことにする instead
• In very formal writing where a more sophisticated expression would be expected

Example Sentences#

• 壁を白く塗ることになりました。 — I decided to paint the walls white.
• 妹が留学することになりました。 — It was decided that my sister would study abroad.
• 両親と一緒に住むことになりました。 — It was decided that we would live with my parents.

Practice#

Try reading these sentences aloud, then check the translation and vocabulary:

Common Mistakes#

1. Confusing 〜ことになる with 〜ことにする — While both are related, 〜ことになる expresses "it turns out that ~" whereas 〜ことにする expresses "decide to ~." Pay attention to the specific nuance each pattern conveys.
2. Using 〜ことになる interchangeably with 〜となっている — These patterns are similar but not identical. 〜となっている (has become / is (established)) may be preferred in different contexts or registers.
3. Wrong verb group conjugation — Group 1 and Group 2 verbs conjugate differently. Common pitfall: treating Group 1 verbs ending in る (like 帰る) as Group 2 verbs.

Related Patterns#

• 〜ことにする (decide to ~) — Compare
• 〜となっている (has become / is (established)) — Similar