1. el señor montoya (beep) el profesor de economía. (/)
2. (beep) de salamanca. (/)
3. la cafetería no (beep) al lado de la biblioteca. (/)
4. tú (beep) la compañera de cuarto de maría elena, ¿verdad? (/)
5. ahora los chicos (beep) en clase. (/)
6. (beep) las dos y media. (/)

1. Es

2. Es

3. Está

4. Eres

5. Están

6. Son

Explanation:

1. Verb "Ser" (to be), conjugated in 3rd person singular "Él". Used to describe someone or something´s qualities. In english: Mr Montoya IS the Economics teacher

2. Verb "Ser" (to be), conjugated in 3rd person singular "Él". Used to describe where someone or something is from. In english: He IS from Salamanca

3. Verb "estar" (to be), conjugated in 3rd person singular "Eso". Used to describe someone or something´s location in space. In english: The coffee shop IS not next to the library.

4. Verb "ser" (to be), conjugated in 2nd person singular "Tú". Used to describe someone's or something's qualities. In english:You ARE Maria Elena´s roommate, right?

5. Verb "estar" (to be), conjugated in 3rd person plural "Ellos". Used to describe someone's or something's location. In english: Right now the kids ARE in class.

6. Verb "ser" (to be). conjugated in 3rd person plural. Used to tell the time. In english: It IS two thirty.