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If you've been linked to this, you probably made a language mistake and whoever sent this to you cared enough to point it out. The best thing to do is read the details and see where you went wrong.
"Affect" is usually a verb, meaning to "influence; alter; change", while "effect" is usually a noun, meaning "result; outcome".
"Affect" can be a noun, meaning "emotional state", and "effect" can be a verb, meaning to "bring about". However, these meanings are less common, so use the usual meanings if you are unsure.
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