English verb conjugation CAN KNOCK

Regular verb: knock - knocked - knocked

Affirmation

Simple form

I can knock
you can knock
he can knock
we can knock
you can knock
they can knock

V-ing form

I can be knocking
you can be knocking
he can be knocking
we can be knocking
you can be knocking
they can be knocking

Perfect

I can have knocked
you can have knocked
he can have knocked
we can have knocked
you can have knocked
they can have knocked

V-ing perfect

I can have been knocking
you can have been knocking
he can have been knocking
we can have been knocking
you can have been knocking
they can have been knocking

Negation

Simple form

I can't knock
you can't knock
he can't knock
we can't knock
you can't knock
they can't knock

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

can I knock?
can you knock?
can he knock?
can we knock?
can you knock?
can they knock?

V-ing form

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

Perfect

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

V-ing perfect

can I have been knocking?
can you have been knocking?
can he have been knocking?
can we have been knocking?
can you have been knocking?
can they have been knocking?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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