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Structure

Formal

V + 기로 해요

V + 기로 했어요

Informal

V + 기로 해

V + 기로 했어

Plain

V + 기로 하다

Suggestion

V + 기로 하자

V + 기로 해요 (polite)

-기로 하다 expresses making a decision or plan to do something. It's used when you've made up your mind about an action.

Personal decisions - Choices you make for yourself

Agreements - Decisions made together with others

내년에일본에가기로했어.

I decided to go to Japan next year.

우리내일만나기로하자.

Let's decide to meet tomorrow.

Use -기로 하다 for decisions you control. For external circumstances or things that just happen, use other grammar like -게 되다.

-기로 하다 = decide to do

- 가기로 했어요 (decided to go)

-기로 되다 = it was decided (by others)

- 가기로 됐어요 (it's been decided I'll go)

Past tense 했어요 for completed decision

내년에일본에가기로했어.

I decided to go to Japan next year.

우리내일만나기로하자.

Let us decide to meet tomorrow.

담배를끊기로했어요.

I decided to quit smoking.

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