English verb conjugation
CAN KNIFE

Regular verb: knife - knifed - knifed

Affirmation

Simple form	V-ing form
I can knife you can knife he can knife we can knife you can knife they can knife	I can be knifing you can be knifing he 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 he 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 he 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 can't knife you can't knife he can't knife we can't knife you can't knife they can't knife	I can't be knifing you can't be knifing he can't be knifing we can't be knifing you can't be knifing they can't be knifing
Perfect	V-ing perfect
I can't have knifed you can't have knifed he can't have knifed we can't have knifed you can't have knifed they can't have knifed	I can't have been knifing you can't have been knifing he can't have been knifing we can't have been knifing you can't have been knifing they can't have been knifing

Interrogative form

Simple form	V-ing form
can I knife? can you knife? can he knife? can we knife? can you knife? can they knife?	can I be knifing? can you be knifing? can he 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 he 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 he 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't I knife? can't you knife? can't he knife? can't we knife? can't you knife? can't they knife?	can't I be knifing? can't you be knifing? can't he be knifing? can't we be knifing? can't you be knifing? can't they be knifing?
Perfect	V-ing perfect
can't I have knifed? can't you have knifed? can't he have knifed? can't we have knifed? can't you have knifed? can't they have knifed?	can't I have been knifing? can't you have been knifing? can't he have been knifing? can't we have been knifing? can't you have been knifing? can't they have been knifing?