How do I change the subject from singular to plural in a sentence?

Question

How do I change the subject from singular to plural, or plural to singular in a sentence? Examples:

1. Usted escucha a la profesora.
2. El medico trabaja en un hospital.
3. El alumno usa un lapiz en la clase de matematicas.
4. Mis amigos y yo no hablamos mucho en la clase.

Thank you VERY much for your assistance, my stepson and I appreciate your help! Sincerely, Cindy

Answer 1

Ustedes escuchan vosotros escucháis a la profesora,
Los medicos trabajan,
Los alumnos usan,
Mi amigo y yo no hablamos ...

The last sentence must be plural because there are two people as subject.

Answer 2

Just keep your nouns and verbs in agreement (in number). Ustedes escucháis...

Sorry. That should be escuchan. Inadvertantly, I copied the wrong person when I checked the conjugation. - misterD, DIC 3, 2009