Answer:
1. Nosotros/nosotras
2. Vosotros/vosotras
Step-by-step explanation:
In this exercise, you have to answer which conjugation form in the present tense does not change the stem part of the verb. The correct answer is nosotros/nosotras and vosotros/vosotras. For example, if you want to conjugate the verb "querer" in the present tense:
Yo quiero
Tú quieres
Él/ella quiere
Nosotros/nosotras queremos
Vosotros/vosotras queréis
Ellos/ellas quieren
When you conjugate using nosotros/nosotras and vosotros/vosotras, the stem part of the verb does not change.