Tomorrow, tomorrow, tomorrow. Must be a hell of a procrastinator who (finally) wrote this.
They haven't worried about the past, they don't worry about the present, it will be the future that makes them tense.
來日은 걸을 거예요
lol May I ask where you are originally from? Your knowledge of Chinese letters seem to put you on a super fast-track for sure! Good for you!
Isn't walking: 걷다? What happened to the ㄷ?
As per the lesson notes: "For ㄷ special case verbs, those where the final ㄷ becomes a ㄹ, add 을 to the end of the stem. 듣다=>들을"