Affect and Effect
Affect and effect are very easy to get confused. After all, when you affect a situation, you have an effect on it. Here are their most common meanings.
A verb meaning “have an influence on”
A noun meaning “the results of an action”
Less commonly, a verb meaning “to create” (usually followed by the word “change”)
There are several ways to figure out which is correct. You can look to see which part of speech will fit (either verb or noun),
you can try out the definitions in the sentence and see which one makes sense.
Her attitude will ______ her grade in this class.
Replace the definition in the sentence to see which makes sense.
Her attitude will have an influence on her grade in this class. Sounds right. Affect works!
Her attitude will the results of an action her grade in this class. Sounds wrong, since it’s the wrong part of speech.
The _______ of the drugs will stay for some time.
The have an influence on of the drugs will stay for some time. Sounds wrong.
The results of the drugs will stay for some time. That’s right.