There are two ways to say this, using 마지막으로 (the last time) and 가장 최근에 (most recently). To me, 마지막으로 sometimes sounds a little bit negative (like, not having traveled, not going out, etc. for a while), so I prefer using 가장 최근에, when I talk about latest trips. 마지막으로 (the last time) 가장 최근에 (most recently) 한국에 가보다 (to have been to Korea) 한국에 다녀오다 (to return from Korea) * Often, you use 한국에 돌아가다 (to go back to Korea) when you return to Korea and do NOT come back for a long time. 것이=게 1. When was the last time you've been to Korea? 마지막으로 한국에 가본 게 언제예요? 2. When have you been to Korea most recently? 가장 최근(에) 한국에 가본 게 언제예요? ------------------ When was the last time we went out to eat? 우리가 마지막으로 외식한 게 언제지? The country I have visited most recently (The most recent country I have visited) 가장 최근에 가본 나라 Hope this helps.

thank you so much!!!!!!

thank you so much!!!!!!!!!!!!!!!!!!!!!!!!!!

Hi~ I'm Kim from Seoul~! I hope it help you ^^ 마지막으로 한국에 돌아갔던건 언제야? Thanks you for reading my comment! Bye~~!