" "belong to a gallery" = The gallery purchased the item and owns it. "belong in a gallery" = It ought to be on view in a gallery. The gallery does not own it.
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AnonymousI'm just wondering whether those would/should words make a difference or whether they can be used there at all with "belong in"?The modal verbs are grammatically correct. But I would have to see the sentences in context to tell you if it made sense to use them.