Grade 1 grammar worksheet teaching the correct usage of "a" and "an" with example sentences and a cute owl illustration.

Problem Description:

The task is to fill in the blanks with either "a" or "an" in the given sentences. The rule provided is:
- Use "an" before words that begin with a vowel sound (i.e., "a," "e," "i," "o," "u").
- Use "a" before words that begin with a consonant sound.

Solution:

Let's analyze each sentence and determine whether to use "a" or "an" based on the rule.

---

#### 1) There is a / an cat in the yard.
- The word "cat" begins with a consonant sound ("k").
- Therefore, we use "a".
- Correct sentence: There is a cat in the yard.

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#### 2) A / an car is faster than a / an horse.
- The word "car" begins with a consonant sound ("k").
- The word "horse" begins with a consonant sound ("h").
- Therefore, we use "a" for both.
- Correct sentence: A car is faster than a horse.

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#### 3) If there is a / an answer, I will find it.
- The word "answer" begins with a vowel sound ("a").
- Therefore, we use "an".
- Correct sentence: If there is an answer, I will find it.

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#### 4) I see a / an owl on the branch.
- The word "owl" begins with a vowel sound ("o").
- Therefore, we use "an".
- Correct sentence: I see an owl on the branch.

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#### 5) Mom has a / an red dress and a / an pink one.
- The word "red" begins with a consonant sound ("r").
- The word "pink" begins with a consonant sound ("p").
- Therefore, we use "a" for both.
- Correct sentence: Mom has a red dress and a pink one.

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#### 6) Frank wants a / an new bicycle for his birthday.
- The word "new" begins with a vowel sound ("n").
- Therefore, we use "an".
- Correct sentence: Frank wants an new bicycle for his birthday.

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#### 7) The teacher read a / an story to the children.
- The word "story" begins with a consonant sound ("s").
- Therefore, we use "a".
- Correct sentence: The teacher read a story to the children.

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#### 8) A / an event like this happens only once a year.
- The word "event" begins with a vowel sound ("e").
- Therefore, we use "an".
- Correct sentence: An event like this happens only once a year.

---

Final Answer:

1. There is a cat in the yard.
2. A car is faster than a horse.
3. If there is an answer, I will find it.
4. I see an owl on the branch.
5. Mom has a red dress and a pink one.
6. Frank wants an new bicycle for his birthday.
7. The teacher read a story to the children.
8. An event like this happens only once a year.

Boxed Final Answer:
\[
\boxed{
1. \text{There is a cat in the yard.} \\
2. \text{A car is faster than a horse.} \\
3. \text{If there is an answer, I will find it.} \\
4. \text{I see an owl on the branch.} \\
5. \text{Mom has a red dress and a pink one.} \\
6. \text{Frank wants an new bicycle for his birthday.} \\
7. \text{The teacher read a story to the children.} \\
8. \text{An event like this happens only once a year.}
}
\]