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Confusing Words

Affect vs Effect

Affect is usually a verb meaning to influence; effect is usually a noun meaning a result.

Quick Answer

Use 'affect' as a verb (to influence) and 'effect' as a noun (a result).

Core Difference

Affect is most often a verb meaning to influence something; effect is most often a noun meaning the result of a change.

Simple Explanation

The main difference is that 'affect' is usually a verb, and 'effect' is usually a noun. 'Affect' means to influence or change something. For example, 'The weather affects my mood.' 'Effect' means a result or consequence. For example, 'The medicine had a positive effect.' There is also a less common use: 'effect' can be a verb meaning to cause something, but that is rare.

Word Details

affect

verb

to influence or change something

affect somethingbe affected by something

effect

noun

a result or consequence

have an effect on somethingthe effect of something

Examples

affect

The cold weather affected my health.

Verb meaning influenced.

affect

How does stress affect your sleep?

Verb in a question.

affect

The new law will affect many people.

Verb showing impact.

effect

The effect of the medicine was immediate.

Noun meaning result.

effect

Pollution has a harmful effect on the environment.

Noun with adjective.

effect

The new policy had a positive effect on sales.

Noun showing outcome.

Practice Quiz

Choose one answer. Mistakes are saved for review.

1. The new law will ___ many small businesses.

2. The medicine had a strong ___ on him.

3. Stress can ___ your sleep.

4. What was the ___ of the decision?

5. The weather may ___ our travel plans.

Related Word Pairs