Question

modelo
yo compro un escritorio.
es mi escritorio.
ellas compran unos libros.
son sus libros.

1. ustedes compran cuatro sillas.
2. tú compras una mochila.
3. nosotros compramos una mesa.
4. yo compro una maleta.
5. él compra unos lápices.
6. ellos compran una calculadora.

Answer:

To solve this, we follow the model: for singular subjects (like "Ustedes" here? Wait, no, "Ustedes" is plural, but the model has singular "Yo" and plural "Ellas". Wait, the first part: "Yo compro un escritorio. Es mi escritorio." (singular subject, singular possession). The second: "Ellas compran unos libros. Son sus libros." (plural subject, plural possession). So we need to adjust the possession based on the subject's number and person.

1. Ustedes compran cuatro sillas.

• "Ustedes" is plural (you all, formal). The object is "cuatro sillas" (four chairs, plural). So the possession: "Son sus sillas." (Because "Ustedes" uses "sus" for plural possession).

2. Tú compras una mochila.

• "Tú" is singular (you, informal). The object is "una mochila" (a backpack, singular). So possession: "Es tu mochila." ( "Tú" uses "tu" for singular possession, no accent here as it's a possessive adjective, not the pronoun "tú").

3. Nosotros compramos una mesa.

• "Nosotros" is plural (we). The object is "una mesa" (a table, singular). So possession: "Es nuestra mesa." ( "Nosotros" (masculine, but "mesa" is feminine) → "nuestra" for feminine singular possession).

4. Yo compro una maleta.

• "Yo" is singular (I). The object is "una maleta" (a suitcase, singular). So possession: "Es mi maleta." ( "Yo" uses "mi" for singular possession).

5. Él compra unos lápices.

• "Él" is singular (he). The object is "unos lápices" (some pencils, plural). So possession: "Son sus lápices." ( "Él" uses "sus" for plural possession, masculine or feminine plural, since "lápices" is masculine plural).

6. Ellos compran una calculadora.

• "Ellos" is plural (they, masculine). The object is "una calculadora" (a calculator, singular, feminine). So possession: "Es su calculadora." ( "Ellos" uses "su" for singular possession? Wait, no: "Ellos" (plural) with a singular object: "su" is used for singular or plural possession? Wait, "su" can be singular or plural, depending on the object. Wait, "Ellos compran una calculadora" → the calculator belongs to them (ellos), so "Es su calculadora." (Because "ellos" is plural, but the object is singular, so "su" (their) for singular object. Wait, but "sus" is for plural objects. So:

• Singular object: "su" (their, for singular object)
• Plural object: "sus" (their, for plural objects)

So "una calculadora" is singular, so "Es su calculadora."

Final Answers:

1. Son sus sillas.
2. Es tu mochila.
3. Es nuestra mesa.
4. Es mi maleta.
5. Son sus lápices.
6. Es su calculadora.

Wait, let's check the model again. The first model: "Yo compro un escritorio. Es mi escritorio." (singular subject, singular object, "mi" (singular possession)). Second: "Ellas compran unos libros. Son sus libros." (plural subject, plural object, "sus" (plural possession)). So the pattern is:

• If the subject is singular and the object is singular: "Es mi + object"
• If the subject is plural and the object is plural: "Son sus + object"
• If the subject is singular and object is plural: "Son mis + object" (but in the given problems, let's check each:

1. Ustedes (plural) compran cuatro sillas (plural). So "Son sus sillas." (matches the second model: plural subject, plural object → "Son sus...")
2. Tú (singular) compras una mochila (singular). So "Es tu mochila." (matches first model: singular subject, singular object → "Es tu...")
3. Nosotros (plural) compramos una mesa (singular). Wait, the model doesn't have plural subject with singular object. But "nosotros" is "we", so possession is "nuestra" (feminine singular, since "mesa" is feminine). So "Es nuestra mesa."
4. Yo (singular) compro una maleta (singular). So "Es mi maleta." (matches first model)
5. Él (singular) compra unos lápices (plural). So "Son sus lápices." (plural object, so "son sus...")
6. Ellos (plural) compran una calculadora (singular). So "Es su calculadora." (singular object, so "es su...")

Yes, that makes sense. So the answers are:

1. Son sus sillas.
2. Es tu mochila.
3. Es nuestra mesa.
4. Es mi maleta.
5. Son sus lápices.
6. Es su calculadora.