English verb conjugation
COULD KNELL

Regular verb: knell - knelled - knelled

Affirmation

Simple form	V-ing form
I could knell you could knell he could knell we could knell you could knell they could knell	I could be knelling you could be knelling he could be knelling we could be knelling you could be knelling they could be knelling
Perfect	V-ing perfect
I could have knelled you could have knelled he could have knelled we could have knelled you could have knelled they could have knelled	I could have been knelling you could have been knelling he could have been knelling we could have been knelling you could have been knelling they could have been knelling

Negation

Simple form	V-ing form
I couldn't knell you couldn't knell he couldn't knell we couldn't knell you couldn't knell they couldn't knell	I couldn't be knelling you couldn't be knelling he couldn't be knelling we couldn't be knelling you couldn't be knelling they couldn't be knelling
Perfect	V-ing perfect
I couldn't have knelled you couldn't have knelled he couldn't have knelled we couldn't have knelled you couldn't have knelled they couldn't have knelled	I couldn't have been knelling you couldn't have been knelling he couldn't have been knelling we couldn't have been knelling you couldn't have been knelling they couldn't have been knelling

Interrogative form

Simple form	V-ing form
could I knell? could you knell? could he knell? could we knell? could you knell? could they knell?	could I be knelling? could you be knelling? could he be knelling? could we be knelling? could you be knelling? could they be knelling?
Perfect	V-ing perfect
could I have knelled? could you have knelled? could he have knelled? could we have knelled? could you have knelled? could they have knelled?	could I have been knelling? could you have been knelling? could he have been knelling? could we have been knelling? could you have been knelling? could they have been knelling?

Interro-negative form

Simple form	V-ing form
couldn't I knell? couldn't you knell? couldn't he knell? couldn't we knell? couldn't you knell? couldn't they knell?	couldn't I be knelling? couldn't you be knelling? couldn't he be knelling? couldn't we be knelling? couldn't you be knelling? couldn't they be knelling?
Perfect	V-ing perfect
couldn't I have knelled? couldn't you have knelled? couldn't he have knelled? couldn't we have knelled? couldn't you have knelled? couldn't they have knelled?	couldn't I have been knelling? couldn't you have been knelling? couldn't he have been knelling? couldn't we have been knelling? couldn't you have been knelling? couldn't they have been knelling?