Grade 3 worksheet on possessive nouns from K5 Learning, designed to help students practice using possessive forms in sentences.

Problem Overview:

The task involves rewriting sentences using possessive nouns. Possessive nouns are used to show ownership or possession. The general rule for forming possessive nouns is:

1. For singular nouns, add an apostrophe and an "s" (e.g., Bill → Bill's).
2. For plural nouns that do not end in "s," add an apostrophe and an "s" (e.g., children → children's).
3. For plural nouns that already end in "s," just add an apostrophe (e.g., cats → cats').

Solution:

#### Part 1: Rewrite the sentence using possessive nouns.
We will rewrite each sentence by replacing the phrase "belongs to [name]" with the possessive form of the noun.

1. The cards belong to Bill.
- Possessive form: Bill's
- Rewritten sentence: The cards are Bill's.

2. The toys belong to my cousins.
- Possessive form: cousins' (plural noun ending in "s")
- Rewritten sentence: The toys are my cousins'.

3. The pens belong to Jenna.
- Possessive form: Jenna's
- Rewritten sentence: The pens are Jenna's.

4. The crackers belong to Maria.
- Possessive form: Maria's
- Rewritten sentence: The crackers are Maria's.

5. The bike belongs to your neighbors.
- Possessive form: neighbors' (plural noun ending in "s")
- Rewritten sentence: The bike is your neighbors'.

6. The phone belongs to your sister.
- Possessive form: sister's
- Rewritten sentence: The phone is your sister's.

7. The shirt belongs to her mother.
- Possessive form: mother's
- Rewritten sentence: The shirt is her mother's.

8. The engine belongs to the plane.
- Possessive form: plane's
- Rewritten sentence: The engine is the plane's.

---

#### Part 2: Rewrite each sentence using the possessive form for each underlined noun.
We will replace the underlined nouns with their possessive forms.

1. We took the minivan that belongs to Rebecca.
- Underlined noun: Rebecca
- Possessive form: Rebecca's
- Rewritten sentence: We took Rebecca's minivan.

2. The windows of our cars are clean.
- Underlined noun: cars
- Possessive form: cars' (plural noun ending in "s")
- Rewritten sentence: The windows of our cars' are clean.

3. Hang the coat of your friend on the hook.
- Underlined noun: friend
- Possessive form: friend's
- Rewritten sentence: Hang your friend's coat on the hook.

4. The doors of the school are locked at night.
- Underlined noun: school
- Possessive form: school's
- Rewritten sentence: The school's doors are locked at night.

---

Final Answer:

#### Part 1:
1. The cards are Bill's.
2. The toys are my cousins'.
3. The pens are Jenna's.
4. The crackers are Maria's.
5. The bike is your neighbors'.
6. The phone is your sister's.
7. The shirt is her mother's.
8. The engine is the plane's.

#### Part 2:
1. We took Rebecca's minivan.
2. The windows of our cars' are clean.
3. Hang your friend's coat on the hook.
4. The school's doors are locked at night.

Boxed Final Answer:
\[
\boxed{
\text{Part 1: 1. The cards are Bill's. 2. The toys are my cousins'. 3. The pens are Jenna's. 4. The crackers are Maria's. 5. The bike is your neighbors'. 6. The phone is your sister's. 7. The shirt is her mother's. 8. The engine is the plane's.}
}
\]
\[
\boxed{
\text{Part 2: 1. We took Rebecca's minivan. 2. The windows of our cars' are clean. 3. Hang your friend's coat on the hook. 4. The school's doors are locked at night.}
}
\]