전치사 Preposition - Prepositions help show us where things are in space and time (where, when, how) 시간 전치사 Prepostisons of Time - After, At Before, By, For, In, On, Since, Until - After The bats come out after the sund goes down - At: Precise The Vampire wakes at 10pm - Before Can yo take out the garbage before you leave the house? - By: Precise of end This place had better be clean by 3pm - For: ..