마지막으로 + WH
Let’s take a look at the pattern 마지막으로 + WH. 마지막 means last and 마지막으로 refers to the very last thing in a sequence. It can the very last place you went, the very last food you ate, or the the very last words you said. We can use this pattern to ask about those things. What follows 마지막으로 is the verb in its past tense form. When we say past tense, we are not talking about the ㅆ form, but the (으)ㄴ form because it has to modify a noun- like 것, 말, 데, etc. So if you want to ask what someone last saw, you say 마지막으로 본 게. If you want to ask what someone last said, you say 마지막으로 한 말. See, the noun that follows the verb can be anything. 은 si attached to a verb that ends ina consonant and ㄴ is attached to a verb that ends in a vowel. The question word can be any of the three, 어디, 무엇, and 누구 plus 이다 (be verb).
김은별 마지막으로 본 게 어디야?
Where did you see Eunbyeol last?
마지막으로 얘기한 게 누구야?
Who was the last one you talked with?
오빠가 마지막으로 간 게 어딘데?
Where did your brother last went?
What’s the last place your brother went to?
채령이가 마지막으로 한 말 뭔데?
What were Chaeryeon’s last words?
마지막으로 먹은 게 뭐야?
What did you last eat?