Grammar review worksheet focusing on articles with fill-in-the-blank exercises and word choices.

Problem Overview:

The task involves identifying and using articles ("a," "an," or "the") correctly in sentences. The goal is to understand when to use each article based on the context of the sentence.

---

Solution:

#### Part 1: Underline the articles in the following sentences.
We need to identify and underline the articles ("a," "an," or "the") in the given sentences.

1. Her cat caught the large mouse.
- Underlined: the

2. The window was open only a crack.
- Underlined: the, a

3. A little boy became a famous student.
- Underlined: A, a

4. When does the train for New York leave the station?
- Underlined: the, the

5. Let the teacher know the minute you have an answer.
- Underlined: the, an

6. Does a big dog have as long a tail as a little dog?
- Underlined: a, a

---

#### Part 2: Write an article in the blanks to complete the sentence.
We need to fill in the blanks with the correct article ("a," "an," or "the").

1. best times to see ______ stars at night.
- Answer: the (refers to specific stars visible at night)

2. good friend tells you ______ truth.
- Answer: the (refers to the concept of truth, which is singular and specific)

3. My favorite snack is ______ apple.
- Answer: an (non-specific apple, and "apple" starts with a vowel sound)

4. It was ______ unusual time to sleep on ______ couch.
- Answers: an, the
- "an unusual time" (non-specific time)
- "the couch" (specific couch being referred to)

---

#### Part 3: Put the correct articles, a or an, in the blank.
We need to choose between "a" and "an" based on whether the word following the article begins with a consonant sound or a vowel sound.

1. dog
- Answer: a (consonant sound)

2. pumpkin
- Answer: a (consonant sound)

3. experience
- Answer: an (vowel sound)

4. hour
- Answer: an (vowel sound)

5. otter
- Answer: a (consonant sound)

6. yellow umbrella
- Answer: a (consonant sound)

7. house
- Answer: a (consonant sound)

---

Final Answers:

#### Part 1: Underlined Articles
1. Her cat caught the large mouse.
2. The window was open only a crack.
3. A little boy became a famous student.
4. When does the train for New York leave the station?
5. Let the teacher know the minute you have an answer.
6. Does a big dog have as long a tail as a little dog?

#### Part 2: Filling in the Blanks
1. best times to see the stars at night.
2. good friend tells you the truth.
3. My favorite snack is an apple.
4. It was an unusual time to sleep on the couch.

#### Part 3: Choosing "a" or "an"
1. a dog
2. a pumpkin
3. an experience
4. an hour
5. a otter
6. a yellow umbrella
7. a house

---

Final Boxed Answer:

\[
\boxed{
\text{See detailed explanations above.}
}
\]