This sentence uses will go in the normal future:
- I will go to the store tomorrow.
But when you are narrating something in the past that uses the same phrase, you must change the tense of the verb:
- I know that yesterday I said I would go to the store today, but I just don’t have time.
Note that this is not a conditional sense of would; rather, here would is just the past tense of will.
This is sometimes known as the “future in the past”.