could knock
Verbo regolare: knock - knocked- knocked

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could knock
you could knock
she could knock
we could knock
you could knock
they could knock 	I could be knocking
you could be knocking
she could be knocking
we could be knocking
you could be knocking
they could be knocking	I could have knocked
you could have knocked
she could have knocked
we could have knocked
you could have knocked
they could have knocked	I could have been knocking
you could have been knocking
she could have been knocking
we could have been knocking
you could have been knocking
they could have been knocking	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not knock
you could not knock
she could not knock
we could not knock
you could not knock
they could not knock 	I could not be knocking
you could not be knocking
she could not be knocking
we could not be knocking
you could not be knocking
they could not be knocking	I could not have knocked
you could not have knocked
she could not have knocked
we could not have knocked
you could not have knocked
they could not have knocked	I could not have been knocking
you could not have been knocking
she could not have been knocking
we could not have been knocking
you could not have been knocking
they could not have been knocking	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I knock?
could you knock?
could she knock?
could we knock?
could you knock?
could they knock? 	could I be knocking?
could you be knocking?
could she be knocking?
could we be knocking?
could you be knocking?
could they be knocking? 	could I have knocked?
could you have knocked?
could she have knocked?
could we have knocked?
could you have knocked?
could they have knocked? 	could I have been knocking?
could you have been knocking?
could she have been knocking?
could we have been knocking?
could you have been knocking?
could they have been knocking? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not knock?
could you not knock?
could she not knock?
could we not knock?
could you not knock?
could they not knock? 	could I not be knocking?
could you not be knocking?
could she not be knocking?
could we not be knocking?
could you not be knocking?
could they not be knocking? 	could I not have knocked?
could you not have knocked?
could she not have knocked?
could we not have knocked?
could you not have knocked?
could they not have knocked? 	could I not have been knocking?
could you not have been knocking?
could she not have been knocking?
could we not have been knocking?
could you not have been knocking?
could they not have been knocking?