What do we call irregular spanish verbs whose stem or root changes? present-tense verbs stem-changing verbs preterit verbs

Yes, irregular verbs are those where the seem or root changes when conjugated, some examples can be:

The verb "ir", where the conjugations in the preterite tense are:

Yo fui

tú fuiste

el fue

etc.

Another example can be "saber"

Yo supe

tú supiste

el supo

etc.

hi

choose the best informal 'tú' translation of the following sentence = run

it's an imperative form ===> corre (tú)

correr (présent)

corro

corres

corre

corremos

corréis

corren

none of thes are

imperative tense

corre (tú) > correct

corra (él/ella/ud)

corramos (nosotros)

corred (vosotros)

corran (ellos/ellas/uds)

hope this will : )

.need more information