Cari perbedaan going to and will be beserta penjelasannya dan contoh kalimatnya! tolong bantu

GOING TO
1. sudah ada rencana sebelum saat bicara.
They're going to retire to the beach - in fact they have already bought a little beach house.
I'm going to accept the job offer.

2. ada bukti/tanda-tanda sesuatu akan terjadi

I think it is going to rain - I just felt a drop.
I don't feel well. I think I'm going to throw up.

3. Ketika sesuatu akan segera terjadi.
Get back! The bomb is going to explode.


WILL
1. keputusan yang baru saja dibuat/spontan
I think I'll try one of those. (I just decided this right now)

2. ramalan/perkiraan
I think it will rain later so take an umbrella with you.

3. menawarkan atau menjanjikan sesuatu
I'll give you a discount if you buy it right now.
I promise I will behave next time.

Bandingkan :
"Are you busy this evening?"
Jika sudah ada rencana --> "Yes, I'm going to the movies."
Jika belum ada rencana --> "I will probably go to the  movies."