English verb conjugation COULD KNOCK

Regular verb: knock - knocked - knocked

Affirmation

Simple form

I could knock
you could knock
he could knock
we could knock
you could knock
they could knock

V-ing form

I could be knocking
you could be knocking
he could be knocking
we could be knocking
you could be knocking
they could be knocking

Perfect

I could have knocked
you could have knocked
he could have knocked
we could have knocked
you could have knocked
they could have knocked

V-ing perfect

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

Negation

Simple form

I could not knock
you could not knock
he could not knock
we could not knock
you could not knock
they could not knock

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I knock?
could you knock?
could he knock?
could we knock?
could you knock?
could they knock?

V-ing form

could I be knocking?
could you be knocking?
could he be knocking?
could we be knocking?
could you be knocking?
could they be knocking?

Perfect

could I have knocked?
could you have knocked?
could he have knocked?
could we have knocked?
could you have knocked?
could they have knocked?

V-ing perfect

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?

Interro-negative form

Simple form

could I not knock?
could you not knock?
could he not knock?
could we not knock?
could you not knock?
could they not knock?

V-ing form

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?

Perfect

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?

V-ing perfect

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?

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