will vs be going to

will

막연한 미래, 방금 결정, 약속/협박

 

- I will go to the moives tomorrow

- Ok, I will take this bulgogi bowl (방금 결정)

- I think you will ask my help(막연한 미래)

- I promise I won't do it agian.(약속)

 

be going to

이미 전에 결정 했거나(스케쥴, 예정), 증거가 있을 때

 

- I am going to go to the movies tomorrow at 5 pm to see the newest X-men.

- I am going to depart from Seoul tomorrow at 6 pm(예정된 미래)

- They are going to win this game because the score is 10 to 0(증거 있는 미래)
- Watch out! the tree is going to fall down(임박한 미래)