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 couldn't knock
you couldn't knock
he couldn't knock
we couldn't knock
you couldn't knock
they couldn't knock

V-ing form

I couldn't be knocking
you couldn't be knocking
he couldn't be knocking
we couldn't be knocking
you couldn't be knocking
they couldn't be knocking

Perfect

I couldn't have knocked
you couldn't have knocked
he couldn't have knocked
we couldn't have knocked
you couldn't have knocked
they couldn't have knocked

V-ing perfect

I couldn't have been knocking
you couldn't have been knocking
he couldn't have been knocking
we couldn't have been knocking
you couldn't have been knocking
they couldn't 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

couldn't I knock?
couldn't you knock?
couldn't he knock?
couldn't we knock?
couldn't you knock?
couldn't they knock?

V-ing form

couldn't I be knocking?
couldn't you be knocking?
couldn't he be knocking?
couldn't we be knocking?
couldn't you be knocking?
couldn't they be knocking?

Perfect

couldn't I have knocked?
couldn't you have knocked?
couldn't he have knocked?
couldn't we have knocked?
couldn't you have knocked?
couldn't they have knocked?

V-ing perfect

couldn't I have been knocking?
couldn't you have been knocking?
couldn't he have been knocking?
couldn't we have been knocking?
couldn't you have been knocking?
couldn't they have been knocking?

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