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