Let's learn about "마음이 변했어요"

마음이 변했어요 : I have changed; Things are different now

[other expressions]

- 마음이 변했다. (to younger people or friends)

- 마음이 변했네. (to younger people or friends)

- 마음이 변했어. (to younger people or friends)

- 마음이 변했네요. (honourific by '요')

- 마음이 변했어요. (honourific by '요')

- 마음이 변했습니다. (formal; more honourific by '스')

[explanations]

* 내 : a short form of 나의

* 나 : I (non-honourific word)

* 제 : a short form of 저의

* 저 : I (honourific word)

* -의 : a suffix makes 나 / 저 possesive

* 맘 : a short form of 마음(heart; mind)

* -이 : a particle makes 마음 subjective after a word ends in a consonant

* 변하다 : change

* 변했다 : past tense of 변하다 by '-었-'

* a verb + -다 / -네 / -어 : a non-honourific descriptive verb ending suffix

* a verb + -네 / -어 + -요 : an honourific verb ending suffix

* a verb +  -습니다 / -ㅂ니다 : an honourific descriptive verb ending suffix by '스' / '-ㅂ'