Conjugación del verbo inglés
COULD KNOCK

Verbo regular: knock - knocked - knocked

Afirmación

Forma simple	Forma 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
Perfecto	Perfecto con V-ing
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

Negación

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