can knell
Regular verb: knell - knelled- knelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can knell
you can knell
she can knell
we can knell
you can knell
they can knell 	I can be knelling
you can be knelling
she can be knelling
we can be knelling
you can be knelling
they can be knelling	I can have knelled
you can have knelled
she can have knelled
we can have knelled
you can have knelled
they can have knelled	I can have been knelling
you can have been knelling
she can have been knelling
we can have been knelling
you can have been knelling
they can have been knelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't knell
you can't knell
she can't knell
we can't knell
you can't knell
they can't knell 	I can't be knelling
you can't be knelling
she can't be knelling
we can't be knelling
you can't be knelling
they can't be knelling	I can't have knelled
you can't have knelled
she can't have knelled
we can't have knelled
you can't have knelled
they can't have knelled	I can't have been knelling
you can't have been knelling
she can't have been knelling
we can't have been knelling
you can't have been knelling
they can't have been knelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I knell?
can you knell?
can she knell?
can we knell?
can you knell?
can they knell? 	can I be knelling?
can you be knelling?
can she be knelling?
can we be knelling?
can you be knelling?
can they be knelling? 	can I have knelled?
can you have knelled?
can she have knelled?
can we have knelled?
can you have knelled?
can they have knelled? 	can I have been knelling?
can you have been knelling?
can she have been knelling?
can we have been knelling?
can you have been knelling?
can they have been knelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I knell?
can't you knell?
can't she knell?
can't we knell?
can't you knell?
can't they knell? 	can't I be knelling?
can't you be knelling?
can't she be knelling?
can't we be knelling?
can't you be knelling?
can't they be knelling? 	can't I have knelled?
can't you have knelled?
can't she have knelled?
can't we have knelled?
can't you have knelled?
can't they have knelled? 	can't I have been knelling?
can't you have been knelling?
can't she have been knelling?
can't we have been knelling?
can't you have been knelling?
can't they have been knelling?