What is the difference between 갈 거야, 가겠어, and 가고있어?
Earlier today, I was speaking to my Korean friend, and she tried to explain the difference between 갈 거야, 가겠어, and 가고있어, but through her broken English, I wasn't able to understand the difference. Are they interchangeable? What are their differences and connotations?

Question

Answer

가고 있다 is present continuous. "I am going"
갈 거다 is future. "I will go"
가겠다 can also mean future, especially when used very formally to ask a question or for short, formal responses.
Ex. Yes sir, I will definitely go!
네, 꼭 가겠습니다!
But more often V + 겠 means something closer to "would."
Ex. If it were you, would YOU go? (implying it's a bad idea, you would not)
너같으면 가겠어?
Honestly, the usages, for "겠" are pretty complex and depend a lot on the context.

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