What's the difference between using "couldn't have said it better" and "couldn't of said it better"
lime silver couldn't have said it better That's correct. ------------------------------ lime silver couldn't of said it better That's incorrect.
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lime silvercouldn't have said it better
That's correct.
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lime silvercouldn't of said it better
That's incorrect.
Note that in "couldn't have", "have" is pronounced the same as the word "of", especially in fast speech. When people write it, they confuse the two words and sometimes write the wrong one ("of") because of this identical pronunciation.
This is also true of other pairs of words in English. Writers don't always pick the right one.
you're - your / they're - their / it's -