I may frown you may frown he may frown we may frown you may frown they may frown
V-ing form
I may be frowning you may be frowning he may be frowning we may be frowning you may be frowning they may be frowning
Perfect
I may have frowned you may have frowned he may have frowned we may have frowned you may have frowned they may have frowned
V-ing perfect
I may have been frowning you may have been frowning he may have been frowning we may have been frowning you may have been frowning they may have been frowning
Negation
Simple form
I may not frown you may not frown he may not frown we may not frown you may not frown they may not frown
V-ing form
I may not be frowning you may not be frowning he may not be frowning we may not be frowning you may not be frowning they may not be frowning
Perfect
I may not have frowned you may not have frowned he may not have frowned we may not have frowned you may not have frowned they may not have frowned
V-ing perfect
I may not have been frowning you may not have been frowning he may not have been frowning we may not have been frowning you may not have been frowning they may not have been frowning
Interrogative form
Simple form
may I frown? may you frown? may he frown? may we frown? may you frown? may they frown?
V-ing form
may I be frowning? may you be frowning? may he be frowning? may we be frowning? may you be frowning? may they be frowning?
Perfect
may I have frowned? may you have frowned? may he have frowned? may we have frowned? may you have frowned? may they have frowned?
V-ing perfect
may I have been frowning? may you have been frowning? may he have been frowning? may we have been frowning? may you have been frowning? may they have been frowning?
Interro-negative form
Simple form
may I not frown? may you not frown? may he not frown? may we not frown? may you not frown? may they not frown?
V-ing form
may I not be frowning? may you not be frowning? may he not be frowning? may we not be frowning? may you not be frowning? may they not be frowning?
Perfect
may I not have frowned? may you not have frowned? may he not have frowned? may we not have frowned? may you not have frowned? may they not have frowned?
V-ing perfect
may I not have been frowning? may you not have been frowning? may he not have been frowning? may we not have been frowning? may you not have been frowning? may they not have been frowning?