Answer:
Juan es <u>un</u> chico inteligente.
Explanation:
The reason why A is correct is because Juan is singular and masculine, making the answer 'un.'
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Answer:
1. El avión <u>está</u><u> </u><u>despegando</u><u>.</u>
2. Nosotros <u>e</u><u>s</u><u>t</u><u>a</u><u>m</u><u>o</u><u>s</u><u> </u><u>haciendo</u><u> </u>cola en el mostrador.
3. Ellos <u>están</u><u> </u><u>s</u><u>a</u><u>l</u><u>i</u><u>e</u><u>n</u><u>d</u><u>o</u><u> </u>a tiempo.
4. Los pasajeros <u>están</u><u> </u><u>esperando</u> en la puerta de salida.
5. Yo <u>estoy</u><u> </u><u>leyendo</u> mi libro favorito.
6. Juan y Marisol <u>están</u><u> </u><u>nadando</u> en el mar.
7. Tú <u>estás</u><u> </u><u>viviendo</u> cerca de mi casa ahora.
Explanation:
In the present progressive tense, the verb ser or estar (to be) and the gerund ending in -ando and -endo(-ing) are added.
- La galleta ⇝ "la"
- Los camarones ⇝ "los"
- El pescado ⇝ "lo"
- Tú ⇝ "te"
- Elena y Mónica ⇝ "las"
- Los dueños ⇝ "los"
- Ana ⇝ "la"
- Diego y yo ⇝ "nos"
- Yo ⇝ "me"

To replace the accompanying noun, write a <u>direct object</u>. They can be replaced if it is masculine it is "lo" (singular) or "los" (plural) and if it is feminine it is "la" (singular) or "las" (plural).
The <u>indirect object</u> replaces the one who receives the verb. It can be replaced, if it is in the third person, "le" (singular) or "les" (plural); they can also be replaced by unstressed pronouns (me, se, te, nos, os).
When a direct object and an indirect object are joined, <u>the indirect object must be put first and then the direct object</u>. When a third person indirect object is added, put "se".
<h3><em><u>MissSpanish</u></em></h3>
2. Teresa ( deber estudiar ) DEBE ESTUDIA
3. Yo ( assistir a clases) ASISTO A CLASES
4. Esteban (escribir cartas). ESCRIBE CARTAS
5. Tú ( leer libros). LEES UN LIBRO
6. Nancy ( vender libros). VENDE LIBROS
C) nieta or granddaughter