Hi, Rusty!
That sounds an interesting "tweet" about the uses of "in" and "to" and "into"!
Now, you have given me something to think about...!
Mostly I think we use the words by instinct without reasoning out what we are doing.
If I have it right, "into" is a preposition, used before a noun or pronoun;
whereas "in" and "to" are both adverbs and prepositions;
" in" is also an adjective and a noun, too.
And sometimes they are both part of a verb.
I shall be interested to learn all about this properly when you have read it up!
As regards "shall" and "will"........
I always remember the sayings we were taught at school!
" I SHALL drown and no -one WILL save me" means that one expects to drown.
Whereas
"I WILL drown and no one SHALL save me".......implies suicidal intent!
I think the general rule is that "shall" should be used with first persons singular and plural, and "will" is used with second and third persons.
English Grammar is one of my hobby horses!
Of course, I am not always correct in my personal usage! but I thoroughly enjoy looking into it!
I hope you have a good time at wherever you end up on your outing!
Hopefully, you will make it to the Pine Cone though, as planned, without too many deviations!
I am being beset by "junk" phone calls this morning.......very irritating!