Seit oder vor? Which of these two german time preposition you need to use for: since for and ago? These English time prepositions can be quiet confusing sometimes. Not so in German! :) We only have two actually: Seit oder vor. In this lesson I will teach you with example sentences all you need to know about these two important time prepositions: When and how to use them and what key features they have so you will never take the wrong one anymore.