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My bad. Deleted.

I agree with what It-Ogo wrote about the stressed prepositions. I just want to add something more on it.

1) This question has been asked several times on this forum. Try searching some older...

I would say in the last case both "соберём" and "будем собирать" are possible, depending on what you focus at. More context is needed.

As to me, I think "... а персики будем собирать через две...

The regressive voice adjustment even spreads beyond lexical borders.
For example, if a speaker says "вес бутылки" (weight of the bottle) without a pause, it becomes [вЕзбутЫлки], and "вот город"...