affect vs effect
Affect vs Effect: The 2-Second Rule That Actually Sticks
Ninety-five percent of the time the rule is one line: affect is a verb (the action), effect is a noun (the result). The weather affects your mood; the weather has an effect on your mood. The other five percent is why this pair still trips everyone. Here's the fast rule, the test, and the exceptions worth knowing.
The rule and the memory trick
RAVEN: Remember, Affect is a Verb, Effect is a Noun. Something affects something else; something has an effect. If you can put "the" or "an" in front of it, you want effect - articles go with nouns. If it's the thing being done, you want affect.
| Sentence | Which one | Why |
|---|---|---|
| "The news really ___ed me" | affected | it's the action - a verb |
| "The news had a strange ___ on me" | effect | follows "a" - a noun |
| "Coffee doesn't ___ my sleep" | affect | verb - coffee does something |
| "The side ___s are mild" | effects | noun - things that exist |
The swap test
Can't tell? Swap in a word you'd never confuse. Try "influence" - if it fits, use affect ("coffee doesn't influence my sleep" works, so: affect). Try "result" - if it fits, use effect ("the results are mild" works, so: effects). The swap words carry the verb/noun split for you, no grammar terms needed.
The exceptions (rare, but real)
Effect can be a verb meaning to bring about: "the new manager effected real change" - formal, uncommon, mostly in business writing. Affect can be a noun in psychology meaning displayed emotion: "flat affect". If you're not writing a policy memo or a clinical note, you'll almost never need either - the RAVEN rule covers normal life.
Why your phone won't save you
Both spellings are valid words, so autocorrect approves whichever you typed - it checks the dictionary, not the sentence. Catching the wrong one requires knowing whether the slot needed a verb or a noun, which means reading the words around it. That's sentence-level grammar checking: exactly what Checker's Standard Check does in one tap, in whatever app you're typing in.
Frequently asked questions
Is it "affected" or "effected" my mood?
Affected. The mood is being acted on, so you need the verb: "the weather affected my mood".
Is it "in effect" or "in affect"?
In effect - it's the noun. Same with "take effect", "side effects", and "to that effect".
Can "effect" ever be a verb?
Yes, meaning to bring about: "effect change". It's formal and rare - if in doubt, you almost certainly want affect as your verb.
Why doesn't autocorrect flag the wrong one?
Both are correctly spelled words. Only a grammar checker that reads the whole sentence can tell which one the slot needed.