I saw the following quote on Facebook:
A beautiful heart can bring things into your life that all the money in the world couldn't obtain.
Why "couldn't" is used here and not "can't obtain"?
Thanks
, imagining that someone attempted to use all the money in the world to buy such things.
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"couldn't" is used because it is talking about an imagined or hypothetical situation; i.e., imagining that someone attempted to use all the money in the world to buy such things.