Ustedes is the same as what
ellos/ellas
Pensar (e-ie) (ustedes affirmative) changes too...
Piensen
Perder (e-ie) (nosotros negative) changes too...
No Perdamos
Is there a stem change in the nosotros form?
No, it is the same no matter if it is affirmative or negative
Does tu (affirmative) change opposite endings?
No
Pensar (e-ie) (tu affirmative) changes too...
Piensa
car the "c" changes too...
qu
gar the "g" changes too...
gu
zar the "z" changes too...
c
tocar
to play an instrument
Tocar (ustedes affirmative) changes too...
toquen
car, gar, and zar are all still......
ar verbs (change ar to e)
llegar
to arrive
llegar (ustedes affirmative) changes too...
lleguen
comenzar
to commence (start or begin) the "e" changes to "ie" in every form except nosotros.
comenzar (ustedes affirmative) changes too...
comiecen
comenzar (nosotros affirmative) changes too...
Comencemos