Ser is a stem-changing verb. To say they are and we are in Spanish, you would use: son and sois.
I'm currently learning this so I know.
Answer:
70 ACCENTUATION - Practice Classify the words according to their stress. Indicate if they are (a) acute, (ll) flat, (e) esdrújulas (se) sobredrújulas, or (h) hiatus. Write the accent where needed.
Miercoles is the day that’s between martes and jueves
The answer is 10 hope this helps