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 cannot knock
you cannot knock
he cannot knock
we cannot knock
you cannot knock
they cannot knock

V-ing form

I cannot be knocking
you cannot be knocking
he cannot be knocking
we cannot be knocking
you cannot be knocking
they cannot be knocking

Perfect

I cannot have knocked
you cannot have knocked
he cannot have knocked
we cannot have knocked
you cannot have knocked
they cannot have knocked

V-ing perfect

I cannot have been knocking
you cannot have been knocking
he cannot have been knocking
we cannot have been knocking
you cannot have been knocking
they cannot 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 I not knock?
can you not knock?
can he not knock?
can we not knock?
can you not knock?
can they not knock?

V-ing form

can I not be knocking?
can you not be knocking?
can he not be knocking?
can we not be knocking?
can you not be knocking?
can they not be knocking?

Perfect

can I not have knocked?
can you not have knocked?
can he not have knocked?
can we not have knocked?
can you not have knocked?
can they not have knocked?

V-ing perfect

can I not have been knocking?
can you not have been knocking?
can he not have been knocking?
can we not have been knocking?
can you not have been knocking?
can they not have been knocking?

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