English verb conjugation
COULD KNOCK KNOCK

Regular verb: knock knock - knock knocked - knock knocked

Warning, this verb may not exist. Conjugation is given as example.

Affirmation

Simple form	V-ing form
I could knock knock you could knock knock he could knock knock we could knock knock you could knock knock they could knock knock	I could be knock knocking you could be knock knocking he could be knock knocking we could be knock knocking you could be knock knocking they could be knock knocking
Perfect	V-ing perfect
I could have knock knocked you could have knock knocked he could have knock knocked we could have knock knocked you could have knock knocked they could have knock knocked	I could have been knock knocking you could have been knock knocking he could have been knock knocking we could have been knock knocking you could have been knock knocking they could have been knock knocking

Negation

Simple form	V-ing form
I could not knock knock you could not knock knock he could not knock knock we could not knock knock you could not knock knock they could not knock knock	I could not be knock knocking you could not be knock knocking he could not be knock knocking we could not be knock knocking you could not be knock knocking they could not be knock knocking
Perfect	V-ing perfect
I could not have knock knocked you could not have knock knocked he could not have knock knocked we could not have knock knocked you could not have knock knocked they could not have knock knocked	I could not have been knock knocking you could not have been knock knocking he could not have been knock knocking we could not have been knock knocking you could not have been knock knocking they could not have been knock knocking

Interrogative form

Simple form	V-ing form
could I knock knock? could you knock knock? could he knock knock? could we knock knock? could you knock knock? could they knock knock?	could I be knock knocking? could you be knock knocking? could he be knock knocking? could we be knock knocking? could you be knock knocking? could they be knock knocking?
Perfect	V-ing perfect
could I have knock knocked? could you have knock knocked? could he have knock knocked? could we have knock knocked? could you have knock knocked? could they have knock knocked?	could I have been knock knocking? could you have been knock knocking? could he have been knock knocking? could we have been knock knocking? could you have been knock knocking? could they have been knock knocking?

Interro-negative form

Simple form	V-ing form
could I not knock knock? could you not knock knock? could he not knock knock? could we not knock knock? could you not knock knock? could they not knock knock?	could I not be knock knocking? could you not be knock knocking? could he not be knock knocking? could we not be knock knocking? could you not be knock knocking? could they not be knock knocking?
Perfect	V-ing perfect
could I not have knock knocked? could you not have knock knocked? could he not have knock knocked? could we not have knock knocked? could you not have knock knocked? could they not have knock knocked?	could I not have been knock knocking? could you not have been knock knocking? could he not have been knock knocking? could we not have been knock knocking? could you not have been knock knocking? could they not have been knock knocking?