limpiar (affirmative and negative usted and ustedes)
limpie/n, no limpie/n
barrer (affirmative and negative usted and ustedes)
barra/n, no barra/n
sacudir (affirmative and negative usted and ustedes)
sacuda/n, no sacuda/n
decir (affirmative and negative usted and ustedes)
diga/n, no diga/n
pensar (affirmative and negative usted and ustedes)
piense/n, no piense/n
volver (affirmative and negative usted and ustedes)
vuelva/n, no vuelva/n
servir (affirmative and negative usted and ustedes)
sirva/n, no sirva/n