Day 94: Effect is a noun; Affect is a verb.

Effect is a noun that approximately means result. You can write “the effect,” “one effect,” and “an effect” because effect is a noun.

Affect is a verb that approximately means influence. You can write “affects,” “affecting,” and “affected” because it is a verb. [Affect can only be used as a noun when you are writing about an emotional response. A person’s affect is his or her emotional state. In all other cases, it is a verb.]

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If you’re not sure which one you need, and you can’t decide whether you need a noun or a verb, try replacing the word with result and then with influence. Which one is grammatically correct and approximates what you are trying to say? If result, then use effect. If influence, then use affect.