I may tough you may tough he may tough we may tough you may tough they may tough
V-ing form
I may be toughing you may be toughing he may be toughing we may be toughing you may be toughing they may be toughing
Perfect
I may have toughed you may have toughed he may have toughed we may have toughed you may have toughed they may have toughed
V-ing perfect
I may have been toughing you may have been toughing he may have been toughing we may have been toughing you may have been toughing they may have been toughing
Negation
Simple form
I may not tough you may not tough he may not tough we may not tough you may not tough they may not tough
V-ing form
I may not be toughing you may not be toughing he may not be toughing we may not be toughing you may not be toughing they may not be toughing
Perfect
I may not have toughed you may not have toughed he may not have toughed we may not have toughed you may not have toughed they may not have toughed
V-ing perfect
I may not have been toughing you may not have been toughing he may not have been toughing we may not have been toughing you may not have been toughing they may not have been toughing
Interrogative form
Simple form
may I tough? may you tough? may he tough? may we tough? may you tough? may they tough?
V-ing form
may I be toughing? may you be toughing? may he be toughing? may we be toughing? may you be toughing? may they be toughing?
Perfect
may I have toughed? may you have toughed? may he have toughed? may we have toughed? may you have toughed? may they have toughed?
V-ing perfect
may I have been toughing? may you have been toughing? may he have been toughing? may we have been toughing? may you have been toughing? may they have been toughing?
Interro-negative form
Simple form
may I not tough? may you not tough? may he not tough? may we not tough? may you not tough? may they not tough?
V-ing form
may I not be toughing? may you not be toughing? may he not be toughing? may we not be toughing? may you not be toughing? may they not be toughing?
Perfect
may I not have toughed? may you not have toughed? may he not have toughed? may we not have toughed? may you not have toughed? may they not have toughed?
V-ing perfect
may I not have been toughing? may you not have been toughing? may he not have been toughing? may we not have been toughing? may you not have been toughing? may they not have been toughing?