when something is planned or arranged.
-I am going to Spain in a few days. ( I already have my tickets)
Use of will:
when the future is not planned or you make the decision at the moment of speaking.
-I'll probably stay at home today.
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To express a PREDICTION: Will or Be going to
I think it will rain tomorrow OR
I think it's going to rain tomorrow.
To express a PRIOR PLAN: only use BE going to
(This means that you made plans in the past to do the activity)
A: Why did you buy that paint?
B: I'm going to paint my bedroom tomorrow.
(I decided to paint my bedroom yesterday and I intend on painting it tomorrow)
To express WILLINGNESS: only use Will
(The Phone is ringing)
I'll get it! (means that you are volunteering to do it)
Try this site, there are some explanations about that subject.
Will = desire/intention as in "last will and testament" or "god's will"
"I will" is used to expresses a strong desire
Where, "I am going to" is simply a statment of fact. I am going to do it (whether i want to or not).
I think the destinction is really blurred so most people just choose one according to their style.
People are waiting to help.
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