In Spanish, why are the present-tense verbs for TO COMPETE considered to be stem-changing verbs?

Because, in some of them, when E is stressed, it is changed to IE

Because, in some of them, when O is stressed, it is changed to UE

Because, in some of them, when E is stressed, it is changed to I

Because, in some situations, the first-person singular is irregular.

Question

In Spanish, why are the present-tense verbs for TO COMPETE considered to be stem-changing verbs?

Because, in some of them, when E is stressed, it is changed to IE

Because, in some of them, when O is stressed, it is changed to UE

Because, in some of them, when E is stressed, it is changed to I

Because, in some situations, the first-person singular is irregular.

anonymous · Answer

3rd one e to i i believe

anonymous · Answer

@Yeseniiaaa I'm going with it! Thanks!

anonymous · Answer

It was right thanks again! @Yeseniiaaa

anonymous · Answer

welcome