Answer:
Basically what the question is asking is to change the pronouns so that they make sense in the sentence. Either switch the pronouns to be past or present tense to best fit the sentence.
Explanation:
Well, technically, no *SUBJECTS* have stem changes, *VERBS* do.
answer > nosotros (1st person plural)
what exactly is your question
1-C
2-E
3-G
4-F
5-J
6-H
7-B
8-I
9-D
10-A