I may refer you may refer she may refer we may refer you may refer they may refer
Forma con V-ing
I may be referring you may be referring she may be referring we may be referring you may be referring they may be referring
Perfecto
I may have referred you may have referred she may have referred we may have referred you may have referred they may have referred
Perfecto con V-ing
I may have been referring you may have been referring she may have been referring we may have been referring you may have been referring they may have been referring
Negación
Forma simple
I may not refer you may not refer she may not refer we may not refer you may not refer they may not refer
Forma con V-ing
I may not be referring you may not be referring she may not be referring we may not be referring you may not be referring they may not be referring
Perfecto
I may not have referred you may not have referred she may not have referred we may not have referred you may not have referred they may not have referred
Perfecto con V-ing
I may not have been referring you may not have been referring she may not have been referring we may not have been referring you may not have been referring they may not have been referring
Forma interrogativa
Forma simple
may I refer? may you refer? may she refer? may we refer? may you refer? may they refer?
Forma con V-ing
may I be referring? may you be referring? may she be referring? may we be referring? may you be referring? may they be referring?
Perfecto
may I have referred? may you have referred? may she have referred? may we have referred? may you have referred? may they have referred?
Perfecto con V-ing
may I have been referring? may you have been referring? may she have been referring? may we have been referring? may you have been referring? may they have been referring?
Forma interro-negativa
Forma simple
may I not refer? may you not refer? may she not refer? may we not refer? may you not refer? may they not refer?
Forma con V-ing
may I not be referring? may you not be referring? may she not be referring? may we not be referring? may you not be referring? may they not be referring?
Perfecto
may I not have referred? may you not have referred? may she not have referred? may we not have referred? may you not have referred? may they not have referred?
Perfecto con V-ing
may I not have been referring? may you not have been referring? may she not have been referring? may we not have been referring? may you not have been referring? may they not have been referring?