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.
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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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