can knock
Verbo regolare: knock - knocked- knocked

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

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I can't knock
you can't knock
he can't knock
we can't knock
you can't knock
they can't knock 	I can't be knocking
you can't be knocking
he can't be knocking
we can't be knocking
you can't be knocking
they can't be knocking	I can't have knocked
you can't have knocked
he can't have knocked
we can't have knocked
you can't have knocked
they can't have knocked	I can't have been knocking
you can't have been knocking
he can't have been knocking
we can't have been knocking
you can't have been knocking
they can't have been knocking	

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

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can't I knock?
can't you knock?
can't he knock?
can't we knock?
can't you knock?
can't they knock? 	can't I be knocking?
can't you be knocking?
can't he be knocking?
can't we be knocking?
can't you be knocking?
can't they be knocking? 	can't I have knocked?
can't you have knocked?
can't he have knocked?
can't we have knocked?
can't you have knocked?
can't they have knocked? 	can't I have been knocking?
can't you have been knocking?
can't he have been knocking?
can't we have been knocking?
can't you have been knocking?
can't they have been knocking?