Grammar Post 9

affect and effect
how in the world do you know when it is either?
well i struggle with knowing which one you use affect effect seam similar so its hard to differ them in writing. This seemed site seemed to help me the most even though it is not the set rule it is set into examples that makes sense atleast to me i hope it helps!

Affect

Affect with an a means "to influence," as in, "The arrows affected Ardvark," or "The rain affected Amy's hairdo." Affect can also mean, roughly, "to act in a way that you don't feel," as in, "She affected an air of superiority."

Effect

Effect with an e has a lot of subtle meanings as a noun, but to me the meaning "a result" seems to be at the core of all the definitions. For example, you can say, "The effect was eye-popping," or "The sound effects were amazing," or "The rain had no effect on Amy's hairdo."

http://grammar.quickanddirtytips.com/affect-versus-effect.aspx