Affect and effect are easily confused because they look alike. Further, although affect is normally a verb, effect can be either a verb or a noun, adding to the confusion. You can distinguish the two words by taking a closer look at their definitions.
Affect is a verb that most commonly means “to influence.” When used as a verb, effect means “to bring about” or “to accomplish.” When used as a noun, effect means “result” or “consequence.”
Therefore, to choose between affect and effect, you must first consider whether you are using the word as a verb or a noun. If you are using it as a verb, select affect if you mean “to influence” and effect if you mean “to bring about.” As a noun, effect will normally be the correct choice.
- The new law affects voters in several swing states. (affect used as a verb meaning “to influence”)
- The new law will effect a change in the way states recount votes in close elections. (effect used as a verb meaning “to bring about”)
- It is difficult to gauge the effect of the new law. (effect used as a noun meaning “result”)
For more information, see Anne Enquist & Laurel Currie Oates, Just Writing 160-61, 307-08 (3d ed. 2009) and Laurel Currie Oates & Anne Enquist, The Legal Writing Handbook 772 (5th ed. 2010).