be going to : plans you've decided on. (하기로 결정한 일)
will : possible plans before you've made a decision. (아직 결정 안난 일)
1) What are you going to do?
I'm going to relax at the beach.
We're going to go surfing every day.
I'm not going to do anything special.
위는 이미 계획해 둔 것이 있는 경우
2) What are you going to do?
I'm not sure. I guess I'll just stay home.
Maybe I'll watch some movies.
I don't know. I think I'll go comping.
I probably won't go anywhere.
계획이 없거나 확실하지 않을 때.
