English & Language Usage · Knowledge of language
Commonly Confused Words
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Choose commonly confused words by meaning and grammatical function.
Read the explanations, try the quick checks, then take the lesson quiz to see what to review next.
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Let Grammar and Meaning Decide
Sound alone cannot select a homophone. Identify the needed part of speech, substitute a definition, and reread the sentence. Expand contractions: they're must mean they are; it's must mean it is or it has. Affect is usually a verb meaning influence, while effect is usually a noun meaning result; less common uses include effect change and the noun affect. Use fewer with countable items and less with amounts. Use who as a subject and whom as an object.
Worked example: In The new schedule may ___ attendance, the blank needs a verb, so affect fits. In Its main ___ was higher attendance, the blank needs a noun, so use effect.
Why This Matters: Use language structure and context to choose clear, accurate sentences in academic and everyday writing.
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