Yo barrido el piso.
Translation: I sweep the floor.
Answer:
Ser is used in a simple way, to talk about WHAT something is (permanent state). .
Answer:
1. Tú cantas.
2. Ellos conversan.
3. Tú y yo cenamos.
4. La profesora enseña.
5. Mis compañeros viajan.
Explanation:
identifying the person of the narrator, and the time in which it is indicated, we can correctly conjugate the verb, and that it has agreement with what is being expressed.