could knight
Regular verb: knight - knighted- knighted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could knight
you could knight
he could knight
we could knight
you could knight
they could knight 	I could be knighting
you could be knighting
he could be knighting
we could be knighting
you could be knighting
they could be knighting	I could have knighted
you could have knighted
he could have knighted
we could have knighted
you could have knighted
they could have knighted	I could have been knighting
you could have been knighting
he could have been knighting
we could have been knighting
you could have been knighting
they could have been knighting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't knight
you couldn't knight
he couldn't knight
we couldn't knight
you couldn't knight
they couldn't knight 	I couldn't be knighting
you couldn't be knighting
he couldn't be knighting
we couldn't be knighting
you couldn't be knighting
they couldn't be knighting	I couldn't have knighted
you couldn't have knighted
he couldn't have knighted
we couldn't have knighted
you couldn't have knighted
they couldn't have knighted	I couldn't have been knighting
you couldn't have been knighting
he couldn't have been knighting
we couldn't have been knighting
you couldn't have been knighting
they couldn't have been knighting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I knight?
could you knight?
could he knight?
could we knight?
could you knight?
could they knight? 	could I be knighting?
could you be knighting?
could he be knighting?
could we be knighting?
could you be knighting?
could they be knighting? 	could I have knighted?
could you have knighted?
could he have knighted?
could we have knighted?
could you have knighted?
could they have knighted? 	could I have been knighting?
could you have been knighting?
could he have been knighting?
could we have been knighting?
could you have been knighting?
could they have been knighting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I knight?
couldn't you knight?
couldn't he knight?
couldn't we knight?
couldn't you knight?
couldn't they knight? 	couldn't I be knighting?
couldn't you be knighting?
couldn't he be knighting?
couldn't we be knighting?
couldn't you be knighting?
couldn't they be knighting? 	couldn't I have knighted?
couldn't you have knighted?
couldn't he have knighted?
couldn't we have knighted?
couldn't you have knighted?
couldn't they have knighted? 	couldn't I have been knighting?
couldn't you have been knighting?
couldn't he have been knighting?
couldn't we have been knighting?
couldn't you have been knighting?
couldn't they have been knighting?