"Affect" is primarily used as a verb and means to influence, impact, or cause a change in something or someone.
Here's how to use "affect" in sentences:
As a Verb (most common use)
To influence or have an impact on:
The weather will affect our travel plans.
Lack of sleep can affect your ability to concentrate.
His decision will directly affect the entire team.
To move someone emotionally:
The sad news deeply affected everyone in the room.
Her heartfelt speech really affected the audience.
To pretend or assume (less common, more formal):
He affected an air of nonchalance, though he was quite nervous.
She affected a British accent to impress them.
"Affect" vs. "Effect" (Common Confusion)
A very common point of confusion is between "affect" and "effect."
Affect (verb): To influence or change.
The heat affected the chocolate. (The heat caused the chocolate to change)
Effect (noun): The result or outcome of an action or cause.
The effect of the heat was melted chocolate. (Melted chocolate is the result)
Effect (verb - less common): To bring about or accomplish.
The committee sought to effect change in policy. (To bring about change)
Tip: A simple way to remember: Affect is for Action (verb), Effect is for End result (noun).
Examples in various contexts
Health: "Stress can negatively affect your immune system."
Environment: "Pollution affects air quality."
Decision-making: "Personal biases can affect judgment."
Emotions: "The music had a profound affect on her mood." (Note: this is a rarer use of "affect" as a noun, generally referring to psychological states, but "effect" would be more common for the outcome of music on mood).
In most everyday sentences, when you want to express that something causes a change or has an influence, affect is the word you're looking for.
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