Let's learn about "여기까지 걸어왔다"

여기까지 걸어왔어 : I walked all the way here

[other expressions]

- 여기까지 걸어왔다. (to younger people or friends)

- 여기까지 걸어왔네. (to younger people or friends)

- 여기까지 걸어왔어. (to younger people or friends)

- 여기까지 걸어왔네요. (honourific by '-요')

- 여기까지 걸어왔습니다. (formal; more honourific by '-스')

[explanations]

* 여기 : here

* 까지 : until; up to

* 걷다 : [Probunciation: 걷따] [ㄷ 불규칙•this used as the form of 걸으니•걸어] walk; go on foot; tramp; step; hike

- 좀 더 빨리 걸어라 : Walk a little faster

- 둘이 같이 걸으니까 좋네 : It' nice to walk together

* 오다 : come

* 걸어오다 : come on foot <-- 걷다 + -어(a connection suffix) + 오다

- 우리가 걸어온 길 : the path we have followed. 

* 걸어왔습니다 : 걸어왔(the stem of 걸어왔다) + -스(a suffix makes a verb more honourific) + -ㅂ니다(an honourific descriptive verb ending suffix by '-ㅂ')

* 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'