I am going to be teaching this soon and just can't figure out how to explain the difference in uses. As a native speaker I don't think about it.
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Use of I am going to:

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.
Well, not necessarily. I think the main difference is that one is more formal than the other.
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The main differences are:

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)
When I started to teach I had the same problem. Sometimes it is difficult to figure out which one is the correct to use.

Try this site, there are some explanations about that subject.

See Will.
Students: We have free audio pronunciation exercises.
Im really no expert but i always believed it was..
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.
please tell me

what,s the diffrerence between will & going to in english?
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