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