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 could not knell you could not knell he could not knell we could not knell you could not knell they could not knell	I could not be knelling you could not be knelling he could not be knelling we could not be knelling you could not be knelling they could not be knelling
Perfect	V-ing perfect
I could not have knelled you could not have knelled he could not have knelled we could not have knelled you could not have knelled they could not have knelled	I could not have been knelling you could not have been knelling he could not have been knelling we could not have been knelling you could not have been knelling they could not 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
could I not knell? could you not knell? could he not knell? could we not knell? could you not knell? could they not knell?	could I not be knelling? could you not be knelling? could he not be knelling? could we not be knelling? could you not be knelling? could they not be knelling?
Perfect	V-ing perfect
could I not have knelled? could you not have knelled? could he not have knelled? could we not have knelled? could you not have knelled? could they not have knelled?	could I not have been knelling? could you not have been knelling? could he not have been knelling? could we not have been knelling? could you not have been knelling? could they not have been knelling?