Answer:
4. está
5. están
6. está
7. estás
8. estoy; estás
Step-by-step explanation:
estar (to be/feel) is conjugated in the present tense as:
yo - estoy
tú/vos - estás
usted/él/ella/elle - está
nosotros/nosotras - estamos
vosotros/vosotras - estáis
ustedes/ellos/ellas/elles - están
Locate the subject in each question, and conjugate estar accordingly
4. "él" is the subject, so estar is conjugated as está
5. "tus amigos" is the subject (=ellos), so estar is conjugated as están
6. "el cuarto" is the subject, so estar is conjugated as está
7. "tú" is the subject, so estar is conjugated as estás
8. "yo" is the first subject, so estar is conjugated as estoy; "tú"is the second subject, so estar is conjugated as estás