Final answer:
In Spanish, the verb 'ser' is used to express permanent or inherent qualities, while the verb 'estar' is used to express temporary states or conditions. 'Ser' is conjugated as 'es' for the third person singular (Dora is) and 'estar' is conjugated as 'estás' for the second person singular (you are). 'Estar' is also conjugated as 'estamos' for the first person plural (Yolanda and I are).
Step-by-step explanation:
10. Dora es alta, bonita, y simpática. "Dora is tall, pretty, and nice."
11. Tú estás aquí. "You are here."
12. Yolanda y yo estamos tristes. "We are sad."
Learn more about Use of ser and estar in Spanish