Here is a detailed explanation of when to use affect vs effect:
Affect: (verb) – to influence or have an effect on
Used when talking about how something influences or produces a change in something else.
- The new product will affect sales.
- The weather affected our plans for the picnic.
- The medicine will hopefully affect a positive change in his condition.
Effect: (noun) – a change or result that comes about due to an action or event
(verb) - to cause or bring about
As a noun, it refers to something that is created as a result of an action.
- The new policy had a positive effect on the economy.
- There were many unintended effects from the experiment.
As a verb, it means to cause or bring about.
- The new CEO hopes to effect major changes in the company.
- The reporter intended to effect change through his stories.
So in summary:
Use affect as a verb when talking about how something influences or produces a change in something else.
Use effect as a noun to refer to a result or change that comes about as a consequence of an action.
Use effect as a verb to mean to cause or bring about.
Some examples to compare:
- The new medicine will affect/effect a change in his symptoms.
Here affect is correct because it refers to how the medicine will influence or produce a change in his symptoms.
- The new policy had a positive affect/effect.
Here effect is correct because it refers to the result or change that came about due to the policy.
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