"Could of" is a grammatical mistake, while "could have" is the correct phrase to use. "Could have" expresses past ability or possibility, while "could of" does not make sense grammatically.
"Could of" is incorrect because it does not follow the proper grammar rules. The correct phrase is "could have", which expresses the past ability or possibility to do something.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.
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