Hello, I`m not English, but I wanted to chime in because I find it a really good question. The only rather subtle difference I can spot between them is that when you say "I`m going to arrive tomorrow" you have planned for this for some time now and/ or you have some evidence supporting this fact, like plane tickets for example. When, on the other hand, you use the progressive it sounds more close to the present time ( although this is not a real difference between your sentences since you used time adverbials describing near present actions in all ), and you may or may not have planned to do so in advance.
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tarirotari Do you normally use present continuous instead of going to with those verbs, or both, or you do you use them indifferently?I normally use the present continuous, but sometimes I use going to. In my mind, the going to phrasing puts more distance (both temporal and psychological) between me and the action I'm about to undertake. For e