may back
Verbo regular: back - backed- backed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may back
you may back
she may back
we may back
you may back
they may back 	I may be backing
you may be backing
she may be backing
we may be backing
you may be backing
they may be backing	I may have backed
you may have backed
she may have backed
we may have backed
you may have backed
they may have backed	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 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may not back
you may not back
she may not back
we may not back
you may not back
they may not back 	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	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	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 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I back?
may you back?
may she back?
may we back?
may you back?
may they back? 	may I be backing?
may you be backing?
may she be backing?
may we be backing?
may you be backing?
may they be backing? 	may I have backed?
may you have backed?
may she have backed?
may we have backed?
may you have backed?
may they have backed? 	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 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I not back?
may you not back?
may she not back?
may we not back?
may you not back?
may they not back? 	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? 	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? 	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?