In spanish why are the present tents verbs for to compete considered to be stem-changing verbs

Fill the blank with a la, a los, a las, or al. los alumnos .

Discuss your favorite season of the year. describe some of the activities you like to do during that season at home and what you would do if you were in puebla. would you participate in the same activities in puebla as you would at home? would you do different things based on the weather?

True/false: bajo is the opposite of alto. true false