Complete the sentence by stating the definite present consequence with would, not a possibility or ability with could: Sofia did not study Braille as a child, so she cannot read the labels now. If she had learned it then, she ___ them now. (understand)

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Would understand states the definite present consequence that the prompt requests from the unreal childhood condition. Could understand would instead present understanding as an ability or possibility, a standard modal meaning that this premise explicitly sets aside.