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Writer's pictureEsl4everyone, Karen Peterson

When do you use "a" and "an"?


The verb “BE” means “am, is, are and was, were.”

In this lesson, we are going to work on “am, is, are.” Most of you know this:

I am

He/she/it is

We/you/they are

Do you know when to use “a or an”?

  • You must have “a or an” before a singular noun. A singular noun is 1 person, 1 place or 1 thing.

  • Now when do you use “a”? You need “a” when there is a consonant sound. What is a consonant? Any letter that is not a vowel. The vowels are “a,e,I,o, u.” The consonants are the rest of the letters like “b, c, d, etc.”

Here is an example:

Example 1: The U.S. is _____big country. Do you put “a or an” here? If you put “a,” you’re right. You need “a” because “b” in big is a consonant sound.

  • You must use “an” when there is a vowel sound.

Here is another example:

Example 2: I am ____________English teacher. Do you put “a or an” here? If you put “an,” you’re right. You need it because “E” is a vowel sound.

You don’t use “a or an” in front of plural nouns. Plural nouns usually have an “s” like teachers, students or countries.

Let’s look at another example:

The U.S. and Canada are___________big countries.

  • You don’t use “a or an” because the noun is “countries” and it is plural. It has an s.

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