If you just decide something what you want to do in future you use: will I will go shopping tomorrow. (I just decided it) But if you have arranged / planed something than you use going to. I'm going to go shopping tomorrow with Ann.
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New2grammarIs it true that in most cases, when the word 'tomorrow' is placed at the beginning of a sentence it will be followed by "will' and when it is placed at the end of a sentence it is preceded by 'going to'?Not true. Where on earth did you get that idea?