This is basic Korean grammar series for beginner level Korean language learners. These grammar lessons are useful for people preparing for TOPIK I. In this lesson you will learn how to use V + 고 있다 and -고 싶다 Korean Verb Endings. -고 있다 is present continuous verb ending which shows that some action is going on currently. 고 싶다 is used to express wish or desire (want to do something).