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