V-기로 하다
Use V-기로 하다 after a verb stem to say you have decided to do something. It is a very common pattern for intentions and personal decisions. You can also use V-기로 다짐하다 to mean you strongly resolve to do it. Example: "다음에는 신발 끈을 꼭 묶기로 했어요." This means "I decided to tie my shoelace tightly next time."
다음에는 신발 끈을 꼭 묶기로 했어요.
I decided to tie my shoelace tightly next time.
