I may back you may back she may back we may back you may back they may back
Forma con V-ing
I may be backing you may be backing she may be backing we may be backing you may be backing they may be backing
Perfecto
I may have backed you may have backed she may have backed we may have backed you may have backed they may have backed
Perfecto con V-ing
I may have been backing you may have been backing she may have been backing we may have been backing you may have been backing they may have been backing
Negación
Forma simple
I may not back you may not back she may not back we may not back you may not back they may not back
Forma con V-ing
I may not be backing you may not be backing she may not be backing we may not be backing you may not be backing they may not be backing
Perfecto
I may not have backed you may not have backed she may not have backed we may not have backed you may not have backed they may not have backed
Perfecto con V-ing
I may not have been backing you may not have been backing she may not have been backing we may not have been backing you may not have been backing they may not have been backing
Forma interrogativa
Forma simple
may I back? may you back? may she back? may we back? may you back? may they back?
Forma con V-ing
may I be backing? may you be backing? may she be backing? may we be backing? may you be backing? may they be backing?
Perfecto
may I have backed? may you have backed? may she have backed? may we have backed? may you have backed? may they have backed?
Perfecto con V-ing
may I have been backing? may you have been backing? may she have been backing? may we have been backing? may you have been backing? may they have been backing?
Forma interro-negativa
Forma simple
may I not back? may you not back? may she not back? may we not back? may you not back? may they not back?
Forma con V-ing
may I not be backing? may you not be backing? may she not be backing? may we not be backing? may you not be backing? may they not be backing?
Perfecto
may I not have backed? may you not have backed? may she not have backed? may we not have backed? may you not have backed? may they not have backed?
Perfecto con V-ing
may I not have been backing? may you not have been backing? may she not have been backing? may we not have been backing? may you not have been backing? may they not have been backing?