Nowadays, there are many ways to study English such as study in normal class; school, or study in special class; tutors, which students can personally design lesson. Many students can use English fluently. However, there are also many students who are not fluent in English. One of causes is that they use it unnaturally.
To use English fluently and naturally as native speakers, it is necessary to know and understand phrasal verbs because phrasal verb is often used in spoken language, even if reading and writing. Therefore, researchers aim to investigate knowledge and understanding of phrasal verb in spoken language of students, the third year of English major in Khon Kaen University.