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"

So the conjugation of estudiar is

yo estudio

tú estudias

él/ella estudia

nosotros estudiamos

vosotros estudiáis

ellos/ellas estudian

Now to make a verb agree with the pronoun (yo, tú, él, ella, nosotros, vosotros, ellos, ellas) you must use the correct conjugation of the verb.

The conjugation of the verb estudiar that agrees with yo is estudio.

so your sentence would be:

Sí, yo estudio español en la escuela.

that translates to: Yes, I study spanish in the school.

if you want to say Yes, I study spanish in my school I would say

Sí, yo estudio español en mi escuela.

I hope this helps!