-어서

Etymology
from  +. The postposition is from the infinitive of the verb.

It was uncommon in the fifteenth century but increasingly became more widespread.

Suffix

 * 1) so, since:
 * 2) and then:
 * 1) and then:
 * 1) and then:

Usage notes

 * For vowel harmony, contractions, and allomorphy, see.
 * cannot be used with the tense markers and  in the standard language, but this is still found in colloquial speech.
 * When in the sense of so, since, cannot be followed by imperative or propositive clauses.
 * The words, , , , , and commonly follow the  clause.