Both 뛰따 and 달리다 mean "to run" but what types of settings would one be appropriate to use and the other not? I'm not sure I have a good sense of that difference. My other question is about understanding the usage of -서 and -(으)러 endings on verbs. Here is the practice question I was given: A: 어떻게 오셨습니까? B: 사장님을 ____________ 왔습니다. (만나다) I used 먼너서 but should have used 만나러. I have a better understanding why -러 is correct but not sure it's enough to know how to use the two correctly in the future. I'm hoping some here might share their understanding of the meanings and how they determine which to use.