English verb conjugation
CAN 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 can knock knock you can knock knock he can knock knock we can knock knock you can knock knock they can knock knock	I can be knock knocking you can be knock knocking he can be knock knocking we can be knock knocking you can be knock knocking they can be knock knocking
Perfect	V-ing perfect
I can have knock knocked you can have knock knocked he can have knock knocked we can have knock knocked you can have knock knocked they can have knock knocked	I can have been knock knocking you can have been knock knocking he can have been knock knocking we can have been knock knocking you can have been knock knocking they can have been knock knocking

Negation

Simple form	V-ing form
I can't knock knock you can't knock knock he can't knock knock we can't knock knock you can't knock knock they can't knock knock	I can't be knock knocking you can't be knock knocking he can't be knock knocking we can't be knock knocking you can't be knock knocking they can't be knock knocking
Perfect	V-ing perfect
I can't have knock knocked you can't have knock knocked he can't have knock knocked we can't have knock knocked you can't have knock knocked they can't have knock knocked	I can't have been knock knocking you can't have been knock knocking he can't have been knock knocking we can't have been knock knocking you can't have been knock knocking they can't have been knock knocking

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I knock knock? can't you knock knock? can't he knock knock? can't we knock knock? can't you knock knock? can't they knock knock?	can't I be knock knocking? can't you be knock knocking? can't he be knock knocking? can't we be knock knocking? can't you be knock knocking? can't they be knock knocking?
Perfect	V-ing perfect
can't I have knock knocked? can't you have knock knocked? can't he have knock knocked? can't we have knock knocked? can't you have knock knocked? can't they have knock knocked?	can't I have been knock knocking? can't you have been knock knocking? can't he have been knock knocking? can't we have been knock knocking? can't you have been knock knocking? can't they have been knock knocking?