Question

걷다 + 오다 → 걸어오다 -아/어-, formed by dropping -서 from -아/어서, is used to combine two verbs into one depicting a complex action. When -아/어 is followed by the space separating it from the second verb, the whole structure is seen like two standalone verbs. If -아/어- is followed by the second verb without spacing, the resulting combination is seen like a single verb.

Accepted Answer

to come by walking

Front	걷다 + 오다 → 걸어오다
Back	to come by walking
Notes	-아/어-, formed by dropping -서 from -아/어서, is used to combine two verbs into one depicting a complex action. When -아/어 is followed by the space separating it from the second verb, the whole structure is seen like two standalone verbs. If -아/어- is followed by the second verb without spacing, the resulting combination is seen like a single verb.

걷다 오다 걸어오다 Walking 아/어 Formed Dropping 서