Grammar worksheet focusing on the correct use of "is" and "are" with exercises for identifying subject-verb agreement.

Problem Description:

The task is to correctly use the verbs "is" and "are" in the given sentences. The rule is simple:
- Use are if the subject of the sentence is plural.
- Use is if the subject of the sentence is singular.

Solution:

Let's analyze each sentence and determine whether the subject is singular or plural, then choose the correct verb ("is" or "are").

---

#### 1. The boys are/is going out to play.
- Subject: "The boys" (plural)
- Correct verb: are
- Sentence: The boys are going out to play.

#### 2. Sarah are/is leaving for school.
- Subject: "Sarah" (singular)
- Correct verb: is
- Sentence: Sarah is leaving for school.

#### 3. The battery are/is losing power.
- Subject: "The battery" (singular)
- Correct verb: is
- Sentence: The battery is losing power.

#### 4. The crackers are/is on the table.
- Subject: "The crackers" (plural)
- Correct verb: are
- Sentence: The crackers are on the table.

#### 5. The class are/is putting on a show.
- Subject: "The class" (singular as a collective noun)
- Correct verb: is
- Sentence: The class is putting on a show.

#### 6. A video game are/is a great way to have fun.
- Subject: "A video game" (singular)
- Correct verb: is
- Sentence: A video game is a great way to have fun.

#### 7. They are/is headed for the mall.
- Subject: "They" (plural)
- Correct verb: are
- Sentence: They are headed for the mall.

#### 8. Sean and Amy are/is throwing a party.
- Subject: "Sean and Amy" (plural)
- Correct verb: are
- Sentence: Sean and Amy are throwing a party.

#### 9. Savannah are/is only four years old.
- Subject: "Savannah" (singular)
- Correct verb: is
- Sentence: Savannah is only four years old.

#### 10. Charlotte are/is a singer.
- Subject: "Charlotte" (singular)
- Correct verb: is
- Sentence: Charlotte is a singer.

#### 11. The girls are/is going to draw pictures.
- Subject: "The girls" (plural)
- Correct verb: are
- Sentence: The girls are going to draw pictures.

#### 12. The choir members are/is going to sing.
- Subject: "The choir members" (plural)
- Correct verb: are
- Sentence: The choir members are going to sing.

#### 13. The lights are/is still on.
- Subject: "The lights" (plural)
- Correct verb: are
- Sentence: The lights are still on.

#### 14. The cubs are/is both still asleep.
- Subject: "The cubs" (plural)
- Correct verb: are
- Sentence: The cubs are both still asleep.

#### 15. The books are/is going to fall off the shelf.
- Subject: "The books" (plural)
- Correct verb: are
- Sentence: The books are going to fall off the shelf.

---

Final Answer:

Here are the corrected sentences with the correct verbs:

1. The boys are going out to play.
2. Sarah is leaving for school.
3. The battery is losing power.
4. The crackers are on the table.
5. The class is putting on a show.
6. A video game is a great way to have fun.
7. They are headed for the mall.
8. Sean and Amy are throwing a party.
9. Savannah is only four years old.
10. Charlotte is a singer.
11. The girls are going to draw pictures.
12. The choir members are going to sing.
13. The lights are still on.
14. The cubs are both still asleep.
15. The books are going to fall off the shelf.

\boxed{\text{See the corrected sentences above.}}