Answer:
1. ¿Trabajamos mañana?
2. ¿Ustedes desean bailar? or Ustedes ¿desean bailar?
3. ¿Raúl estudia mucho? or Raúl, ¿estudia mucho?
4. ¿Enseño a las nueve?
5. ¿Luz mira la televisión? or Luz, ¿mira la televisión?
Explanation:
In Spanish, intonation is used for several purposes: Marking interrogative and exclamatory sentences. Topic marking and topicalization, etc. As paralinguistic and extralinguistic information) it serves to give expression to the feelings that accompany the issuance of a particular statement.
Solid, liquid, gas ^^
For example, if you have an ice cube you have a solid piece of matter, but if you heat it up it melts and then it's liquid, and after getting hot enough it evaporates and even though you can't see it it's still there, but as a gas.
By the way, what's this have to do with Spanish?
Atender, working on the same thing, its hard