How do you write the following sentence:
Marcelo, together with Angela and I, are going to...
Marcelo, together with Angela and myself, are going to...
How do you write the following sentence:
Marcelo, together with Angela and I, are going to...
Marcelo, together with Angela and myself, are going to...
The example sentence does not combine Marcelo with Angela and myself as subjects. The sentence can be rewritten like this, which preserves the same grammatical meaning:
"Marcelo is going to ... together with Angela and me/myself".
'together with' introduces Angela and myself as indirect objects of the verb going.
However, if you write it like this:
"Marcelo, Angela and I are going to ... together.", the grammatical meaning changes somewhat, as Marcelo, Angela and I are all the subject of the sentence.
So in this case, I is wrong and me is or myself are both correct (gramatically). Differentiating between me and myself seems to be a matter of style.
He, she and I are joint subjects of the sentence, so you should use 'I' just as if you were saying "I am going to...". The habit of using 'myself' instead of 'I' or 'me' is not correct English.