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Introduction to Exercise 4 - When to use a/an or no article
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The indefinite article has two forms: a and an. Use an only when the first word of a noun or noun phrase begins with a vowel sound (e.g., an idea, an hour).
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Use the indefinite article (a or an) with singular nouns that do not refer to someone or something specific.
Example: Culture plays an important role in shaping a person.
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Do not use the indefinite article (a or an) before non-count or plural nouns.
Incorrect: I researched an information about sugar consumption’s effects on a children.
Corrected: I researched information about sugar consumption’s effects on children.
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Download an explanation of count and non-count nouns (PDF).
The following passages contain mistakes with indefinite articles "a" and "an." Click on the word or phrase that contains the mistake. When you click, a box will appear. Type the correct word or phrase in this box and then click the INSERT button. When you have finished making all the corrections, click DONE to compare WHAT YOU WROTE with WHAT WE WROTE.
Download Grammar Explanation (PDF)
