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