Help please

My spanish teacher said this to me.. look at the ending on your verb. you need to make it agree with "yo" this is my sentence- sí yo estudiar español en la escuela how do i make it agree with "yo"

12 á á é in n ó ó ú ú o choose the answer that best relates to the class or field of study listed below. el francés a. el arte b. la informática c. las ciencias d. las lenguas select the best answer from the choices provided

How many square miles of territory did paraguay lose in the war