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