<span>Stem changing verbs have spelling changes in all forms of present tense EXCEPT nosotros(as) & vosotros(as). Stem of verbs are the part of the infinitive that's left after dropping endings such as -ar, -er, or -ir. Pedir translated is "to ask or order". The way you'd put that in present is Yo - Pido. Tu - Pides. El, Ella, Ust. - Pide. Nosotros - Pedimos. Vosotros - Pedis. Ellos, Ellas, Uds. - Piden. Servir is the same way just replace the -ir with the correct change.</span>
Yo: canto
Tu: cantas
El/ella/usted: canta
Nosotros: cantamos
Vosotros: cantamos?
Ellos/ellas/ustedes: cantan
Yo: practico
Tu: practicas
El/ella/usted: practica
Nosotros: practicamos
Vosotros: practicamos?
Ellos/ellas/ustedes: practican
Bailar = to dance
Correr = to run
Yo: bailo
Tu: bailas
El/ella/usted: baila
Nosotros: bailamos
Vosotros: bailamos?
Ellos/ellas/ustedes: bailan
Yo: corro
Tu: corres
El/ella/usted: corre
Nosotros: corremos
Vosotros: corremos?
Ellos/ellas/ustedes: corren
