if you pay for something you use 'bought'
and if you bring something you use 'brought'
For ex: I bought this for you at the local store in Chicago and
brought it all the way from there.
in vs into
you use 'in' when u're describing a position of an object or a person
you use 'into' if you are describing movement
for ex: the fishes were in the pond and were moving into the river.
(the sentence doesn't make sense but whatever :))
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