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
he could knock
we could knock
you could knock
they could knock 	I could be knocking
you could be knocking
he could be knocking
we could be knocking
you could be knocking
they could be knocking	I could have knocked
you could have knocked
he 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
he 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 couldn't knock
you couldn't knock
he couldn't knock
we couldn't knock
you couldn't knock
they couldn't knock 	I couldn't be knocking
you couldn't be knocking
he couldn't be knocking
we couldn't be knocking
you couldn't be knocking
they couldn't be knocking	I couldn't have knocked
you couldn't have knocked
he couldn't have knocked
we couldn't have knocked
you couldn't have knocked
they couldn't have knocked	I couldn't have been knocking
you couldn't have been knocking
he couldn't have been knocking
we couldn't have been knocking
you couldn't have been knocking
they couldn't have been knocking	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I knock?
could you knock?
could he knock?
could we knock?
could you knock?
could they knock? 	could I be knocking?
could you be knocking?
could he be knocking?
could we be knocking?
could you be knocking?
could they be knocking? 	could I have knocked?
could you have knocked?
could he 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 he 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 	
couldn't I knock?
couldn't you knock?
couldn't he knock?
couldn't we knock?
couldn't you knock?
couldn't they knock? 	couldn't I be knocking?
couldn't you be knocking?
couldn't he be knocking?
couldn't we be knocking?
couldn't you be knocking?
couldn't they be knocking? 	couldn't I have knocked?
couldn't you have knocked?
couldn't he have knocked?
couldn't we have knocked?
couldn't you have knocked?
couldn't they have knocked? 	couldn't I have been knocking?
couldn't you have been knocking?
couldn't he have been knocking?
couldn't we have been knocking?
couldn't you have been knocking?
couldn't they have been knocking?