I'm a little confused by how it works.
Is ~te iku used to refer to something that will happen from now on, or does it refer to something that has already begun to happen and will continue to happen?
A song I'm listening makes use of ~te iku a lot, and from the different places I've looked at, I'm getting different answers. Here's one of the sentences that makes use of it (twice):
君がいない日々を超えて あたしも大人になっていく こうやって全て忘れていくのかな
Would 大人になっていく be "I will become an adult" or "I'm becoming an adult"? Because (I think) she's talking about what's happening now and what will happen in the future. Likewise, would the 忘れていく part be "I wonder if I will forget everything"? Is she talking as if she's already begun to forget and will continue to do so, or she wonders if she will start to?
And finally, in the next line:
この想いが 今春に つつまれていくよ
I'm not sure about at all. "This feeling will be wrapped up in this year's spring"? Or "this feeling is wrapped up [and will continue to be so]"?
One extra query, what does the 'shi' after the negai in this sentence mean?
君と 春に 願いし あの夢は 今も見えているよ
It doesn't seem to fit with the context...