In this video lesson, Hyunwoo explains the difference between 화나다 and 화내다, as well as the basic difference between other similar sets of expressions like the following: 시간이 나다 vs. 시간을 내다 짜증 나다 vs. 짜증 내다 혼나다 vs. 혼내다 힘이 나다 vs. 힘을 내다