may knock
Verbo regular: knock - knocked- knocked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may knock
you may knock
he may knock
we may knock
you may knock
they may knock 	I may be knocking
you may be knocking
he may be knocking
we may be knocking
you may be knocking
they may be knocking	I may have knocked
you may have knocked
he may have knocked
we may have knocked
you may have knocked
they may have knocked	I may have been knocking
you may have been knocking
he may have been knocking
we may have been knocking
you may have been knocking
they may have been knocking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I may not knock
you may not knock
he may not knock
we may not knock
you may not knock
they may not knock 	I may not be knocking
you may not be knocking
he may not be knocking
we may not be knocking
you may not be knocking
they may not be knocking	I may not have knocked
you may not have knocked
he may not have knocked
we may not have knocked
you may not have knocked
they may not have knocked	I may not have been knocking
you may not have been knocking
he may not have been knocking
we may not have been knocking
you may not have been knocking
they may not have been knocking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I knock?
may you knock?
may he knock?
may we knock?
may you knock?
may they knock? 	may I be knocking?
may you be knocking?
may he be knocking?
may we be knocking?
may you be knocking?
may they be knocking? 	may I have knocked?
may you have knocked?
may he have knocked?
may we have knocked?
may you have knocked?
may they have knocked? 	may I have been knocking?
may you have been knocking?
may he have been knocking?
may we have been knocking?
may you have been knocking?
may they have been knocking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
may I not knock?
may you not knock?
may he not knock?
may we not knock?
may you not knock?
may they not knock? 	may I not be knocking?
may you not be knocking?
may he not be knocking?
may we not be knocking?
may you not be knocking?
may they not be knocking? 	may I not have knocked?
may you not have knocked?
may he not have knocked?
may we not have knocked?
may you not have knocked?
may they not have knocked? 	may I not have been knocking?
may you not have been knocking?
may he not have been knocking?
may we not have been knocking?
may you not have been knocking?
may they not have been knocking?