Explain how stem-changing -ir verbs are different from stem-changing -ar and -er verbs in the present subjunctive.

So they all change where the a and e is. IR an ER verbs are basically the same besides the nosotros box where in the IR it is imos instead of emos.

The answer would be ellas (if they are both girls if not use ellos)    van a ( whereever they're going) for example: ellos/ ellas van a el cine 

Los tenis mean the shoes