A prefix is an affix which is placed before the stem of a word

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Are there any patterns to observe in choosing the correct negation prefix to use?

Are there any patterns to observe in choosing the correct prefix to use? There are other prefixes as well, but these are usually the ones I mix up. As in unbelievable, disproportionate, asymmetric, ...
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Why are not “infamous” and “inflammable” the opposite of “famous” and “flammable”?

Why are not infamous and inflammable the opposite of famous and flammable, like incomplete, inactivity, inappropriate and so on?
8
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“Irregardless” vs. “irrespective”

Why is irrespective considered a proper word but irregardless is not?