In Spanish, the verb "estar" is typically used to express locations, conditions, and certain temporary states. Here’s which sentences would likely use "estar" when translated to Spanish:
- The book is on the table. (translate: "El libro está en la mesa.")
- I am well. (translate: "Yo estoy bien.")
- They are tired. (translate: "Ellos están cansados.")
The other sentences would use the verb "ser" instead of "estar":
- I am from Chicago. (translate: "Yo soy de Chicago.")
- It's 2:00. (translate: "Son las 2:00.")
- My friends are at my house. (translate: "Mis amigos están en mi casa." - note that "estar" is used here since it indicates location)
- She is a teacher. (translate: "Ella es maestra.")
- They are my friends. (translate: "Ellos son mis amigos.")
So, specifically for "estar," you should focus on the first, second, and fifth sentences in your list.