Englishfor English speakers
affect
Verb
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If mathx/math affects mathy/math, then mathx/math causes a change in mathy/math.
The movement of the soccer ball was affected by the wind.
Sigmund Freud's ideas were affected by the writings of Frederick Nietzsche.
How do you think the new government will affect the economy?
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If you affect a way of speaking, walking, dressing, etc., you pretend that it is your normal way, often to impress people.
"No, ma'm," Robert said, affecting a southern accent.
affect
Noun
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Your affect is the emotion or feeling you have in response to an idea, object, etc.
Actors need to bring out the affect of the scene.
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Affect is emotion or emotional response.
When teaching, we need to consider both ideas and affect.
function
Noun
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Something or someone's function is its purpose or its job.
The army sometimes performs a policing function.
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A function is an organised event.
I met Sylvia at a church function last week.
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If mathX/math is a function of mathY/math, then mathX/math exists because of or is affected by mathY/math
The speed of the computer is a function of its main processor.
When you see, mathY=f(X)/math, you read it, "mathY/math is a function of mathX/math". Here the value of mathY/math depends on the value assigned to the variable mathX/math.
function
Verb
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If something is functioning, it is working and is not completely broken.
Her heart stopped, but her brain continued to function.
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If something functions as mathX/math, it does the job of mathX/math.
In this sentence, "sentence" functions as the subject.