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