1: A stem change verb is a verb that also makes the change in the stem
2: I'm not sure what this one is i'm sorry
3: -empezar is e-ie
-poder is o-ue
- pedir is e-i
4: i'm very sorry I don't know this one either... I'm just looking at a paper I got in my spanish class for all of the answers
5: there are four types of stem-changing verbs
>o-ue
>e-ie
>e-i
>u-ue