English verb conjugation
CAN KNIFE

Regular verb: knife - knifed - knifed

Affirmation

Simple form	V-ing form
I can knife you can knife she can knife we can knife you can knife they can knife	I can be knifing you can be knifing she can be knifing we can be knifing you can be knifing they can be knifing
Perfect	V-ing perfect
I can have knifed you can have knifed she can have knifed we can have knifed you can have knifed they can have knifed	I can have been knifing you can have been knifing she can have been knifing we can have been knifing you can have been knifing they can have been knifing

Negation

Simple form	V-ing form
I cannot knife you cannot knife she cannot knife we cannot knife you cannot knife they cannot knife	I cannot be knifing you cannot be knifing she cannot be knifing we cannot be knifing you cannot be knifing they cannot be knifing
Perfect	V-ing perfect
I cannot have knifed you cannot have knifed she cannot have knifed we cannot have knifed you cannot have knifed they cannot have knifed	I cannot have been knifing you cannot have been knifing she cannot have been knifing we cannot have been knifing you cannot have been knifing they cannot have been knifing

Interrogative form

Simple form	V-ing form
can I knife? can you knife? can she knife? can we knife? can you knife? can they knife?	can I be knifing? can you be knifing? can she be knifing? can we be knifing? can you be knifing? can they be knifing?
Perfect	V-ing perfect
can I have knifed? can you have knifed? can she have knifed? can we have knifed? can you have knifed? can they have knifed?	can I have been knifing? can you have been knifing? can she have been knifing? can we have been knifing? can you have been knifing? can they have been knifing?

Interro-negative form

Simple form	V-ing form
can I not knife? can you not knife? can she not knife? can we not knife? can you not knife? can they not knife?	can I not be knifing? can you not be knifing? can she not be knifing? can we not be knifing? can you not be knifing? can they not be knifing?
Perfect	V-ing perfect
can I not have knifed? can you not have knifed? can she not have knifed? can we not have knifed? can you not have knifed? can they not have knifed?	can I not have been knifing? can you not have been knifing? can she not have been knifing? can we not have been knifing? can you not have been knifing? can they not have been knifing?