English verb conjugation COULD KNOLL

Regular verb: knoll - knolled - knolled

Affirmation

Simple form

I could knoll
you could knoll
he could knoll
we could knoll
you could knoll
they could knoll

V-ing form

I could be knolling
you could be knolling
he could be knolling
we could be knolling
you could be knolling
they could be knolling

Perfect

I could have knolled
you could have knolled
he could have knolled
we could have knolled
you could have knolled
they could have knolled

V-ing perfect

I could have been knolling
you could have been knolling
he could have been knolling
we could have been knolling
you could have been knolling
they could have been knolling

Negation

Simple form

I couldn't knoll
you couldn't knoll
he couldn't knoll
we couldn't knoll
you couldn't knoll
they couldn't knoll

V-ing form

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

Perfect

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

V-ing perfect

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

Interrogative form

Simple form

could I knoll?
could you knoll?
could he knoll?
could we knoll?
could you knoll?
could they knoll?

V-ing form

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

Perfect

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

V-ing perfect

could I have been knolling?
could you have been knolling?
could he have been knolling?
could we have been knolling?
could you have been knolling?
could they have been knolling?

Interro-negative form

Simple form

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

V-ing form

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

Perfect

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

V-ing perfect

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

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