I may knuckle you may knuckle he may knuckle we may knuckle you may knuckle they may knuckle
V-ing form
I may be knuckling you may be knuckling he may be knuckling we may be knuckling you may be knuckling they may be knuckling
Perfect
I may have knuckled you may have knuckled he may have knuckled we may have knuckled you may have knuckled they may have knuckled
V-ing perfect
I may have been knuckling you may have been knuckling he may have been knuckling we may have been knuckling you may have been knuckling they may have been knuckling
Negation
Simple form
I mayn't knuckle you mayn't knuckle he mayn't knuckle we mayn't knuckle you mayn't knuckle they mayn't knuckle
V-ing form
I mayn't be knuckling you mayn't be knuckling he mayn't be knuckling we mayn't be knuckling you mayn't be knuckling they mayn't be knuckling
Perfect
I mayn't have knuckled you mayn't have knuckled he mayn't have knuckled we mayn't have knuckled you mayn't have knuckled they mayn't have knuckled
V-ing perfect
I mayn't have been knuckling you mayn't have been knuckling he mayn't have been knuckling we mayn't have been knuckling you mayn't have been knuckling they mayn't have been knuckling
Interrogative form
Simple form
may I knuckle? may you knuckle? may he knuckle? may we knuckle? may you knuckle? may they knuckle?
V-ing form
may I be knuckling? may you be knuckling? may he be knuckling? may we be knuckling? may you be knuckling? may they be knuckling?
Perfect
may I have knuckled? may you have knuckled? may he have knuckled? may we have knuckled? may you have knuckled? may they have knuckled?
V-ing perfect
may I have been knuckling? may you have been knuckling? may he have been knuckling? may we have been knuckling? may you have been knuckling? may they have been knuckling?
Interro-negative form
Simple form
mayn't I knuckle? mayn't you knuckle? mayn't he knuckle? mayn't we knuckle? mayn't you knuckle? mayn't they knuckle?
V-ing form
mayn't I be knuckling? mayn't you be knuckling? mayn't he be knuckling? mayn't we be knuckling? mayn't you be knuckling? mayn't they be knuckling?
Perfect
mayn't I have knuckled? mayn't you have knuckled? mayn't he have knuckled? mayn't we have knuckled? mayn't you have knuckled? mayn't they have knuckled?
V-ing perfect
mayn't I have been knuckling? mayn't you have been knuckling? mayn't he have been knuckling? mayn't we have been knuckling? mayn't you have been knuckling? mayn't they have been knuckling?