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