may knife
Regular verb: knife - knifed- knifed

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mayn't knife
you mayn't knife
she mayn't knife
we mayn't knife
you mayn't knife
they mayn't knife 	I mayn't be knifing
you mayn't be knifing
she mayn't be knifing
we mayn't be knifing
you mayn't be knifing
they mayn't be knifing	I mayn't have knifed
you mayn't have knifed
she mayn't have knifed
we mayn't have knifed
you mayn't have knifed
they mayn't have knifed	I mayn't have been knifing
you mayn't have been knifing
she mayn't have been knifing
we mayn't have been knifing
you mayn't have been knifing
they mayn't have been knifing	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mayn't I knife?
mayn't you knife?
mayn't she knife?
mayn't we knife?
mayn't you knife?
mayn't they knife? 	mayn't I be knifing?
mayn't you be knifing?
mayn't she be knifing?
mayn't we be knifing?
mayn't you be knifing?
mayn't they be knifing? 	mayn't I have knifed?
mayn't you have knifed?
mayn't she have knifed?
mayn't we have knifed?
mayn't you have knifed?
mayn't they have knifed? 	mayn't I have been knifing?
mayn't you have been knifing?
mayn't she have been knifing?
mayn't we have been knifing?
mayn't you have been knifing?
mayn't they have been knifing?