should knife
Regular verb: knife - knifed- knifed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should knife
you should knife
he should knife
we should knife
you should knife
they should knife 	I should be knifing
you should be knifing
he should be knifing
we should be knifing
you should be knifing
they should be knifing	I should have knifed
you should have knifed
he should have knifed
we should have knifed
you should have knifed
they should have knifed	I should have been knifing
you should have been knifing
he should have been knifing
we should have been knifing
you should have been knifing
they should have been knifing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not knife
you should not knife
he should not knife
we should not knife
you should not knife
they should not knife 	I should not be knifing
you should not be knifing
he should not be knifing
we should not be knifing
you should not be knifing
they should not be knifing	I should not have knifed
you should not have knifed
he should not have knifed
we should not have knifed
you should not have knifed
they should not have knifed	I should not have been knifing
you should not have been knifing
he should not have been knifing
we should not have been knifing
you should not have been knifing
they should not have been knifing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I knife?
should you knife?
should he knife?
should we knife?
should you knife?
should they knife? 	should I be knifing?
should you be knifing?
should he be knifing?
should we be knifing?
should you be knifing?
should they be knifing? 	should I have knifed?
should you have knifed?
should he have knifed?
should we have knifed?
should you have knifed?
should they have knifed? 	should I have been knifing?
should you have been knifing?
should he have been knifing?
should we have been knifing?
should you have been knifing?
should they have been knifing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I not knife?
should you not knife?
should he not knife?
should we not knife?
should you not knife?
should they not knife? 	should I not be knifing?
should you not be knifing?
should he not be knifing?
should we not be knifing?
should you not be knifing?
should they not be knifing? 	should I not have knifed?
should you not have knifed?
should he not have knifed?
should we not have knifed?
should you not have knifed?
should they not have knifed? 	should I not have been knifing?
should you not have been knifing?
should he not have been knifing?
should we not have been knifing?
should you not have been knifing?
should they not have been knifing?