Explain how to conjugate pedir and servir in the present tense

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.

The verb “pedir”  in English translates as “to ask”

 The conjugation in English is:

 I ask

 You ask

 He asks

 She asks

 It asks

 We ask

 You ask

 They ask

 The conjugation in Spanish is:

 Yo pido

 Tu pides

 El pide

 Ella pide

 Nosotros pedimos

 Ustedes piden

 Ellos piden

 Ellas piden

 The verb “servir”  in English translates as “to serve”

 The conjugation in English is:

 I serve

 You serve

 He serves

 She serves

 It serves

 We serve

 You serve

 They serve

 The conjugation in Spanish is:

 Yo sirvo

 Tú sirves

 El sirve

 Ella sirve

 Nosotros servimos

 Ustedes sirven

 Ellos sirven

 Ellas sirven